Suffolk County, New York: commercial real estate data.
Suffolk County, New York had an estimated 1,535,909 residents on July 1, 2024, up 0.7 percent since the 2020 census base of 1,525,913, across 912 square miles. County output reached $139.01 bn in 2024, 50,748 establishments operate here, and the SBA record carries 2,394 7(a) approvals worth $993.2 m since FY2020.
Underlined figures are computed by MMCG Analytics, not published by the agency.
Suffolk County
How many people live in Suffolk County
- Population, American Community Survey 2020-20241,530,146
- Households512,565
- Average household size2.99
- Median household income$130,686
- Median age41.7
- Median gross rent$2,255 per month
- Median owner-occupied home value$578,400
- Home value to household income4.4 times
- Annual rent as a share of median income20.7 percent
- Adults 25 and over with a bachelor degree or higher40.2 percent
- Adults 25 and over with a graduate degree18.6 percent
- Adults 25 and over1,075,649
- Population under 18317,899
- Share under 1820.8 percent
- Population 65 and over274,038
- Share 65 and over17.9 percent
- Working age population, 18 to 64938,209
- Civilian labor force820,542
- Unemployment rate4.7 percent
- Labor force participation, adults 18 and over67.7 percent
- Rank by population among New York counties4th of 62
- Rank by population among US county-equivalents, Puerto Rico included26th of 3,222
Suffolk County is the 4th largest of 62 New York counties by population. A median home costs 4.4 times median household income, which is seriously unaffordable by national standards. Residents under 18 outnumber those 65 and over, at 20.8 percent against 17.9 percent, a household formation profile rather than a retirement one.
US Census Bureau, American Community Survey 5-Year Estimates, 2020-2024 5-year.
Suffolk County
Is Suffolk County's population growing?
- Population, July 1, 20241,535,909
- Census 2020 base population1,525,913
- Population change since the 2020 census base0.66 percent
- Population change, 2023 to 20246,880
- Births, 202416,207
- Deaths, 202412,813
- Natural change, 20243,394
- Net domestic migration, 2024-6,469
- Net international migration, 20249,881
- Total net migration, 20243,412
- Cumulative net domestic migration, 2021 to 2024-21,113
- Rank by growth among US county-equivalents1600th of 3,144
The county has grown 0.66 percent since the 2020 census base. The population grew in 2024 from both sources: births exceeded deaths and more people moved in than left.
US Census Bureau, Population Estimates Program, Vintage 2024, Vintage 2024, estimates 2020 to 2024.
Suffolk County
Where are people moving to Suffolk County from?
- Tax returns filed by households arriving25,413
- People arriving, from those returns42,861
- Tax returns filed by households leaving31,234
- Net household movement-5,821
- Adjusted gross income arriving$3.67 bn
- Net adjusted gross income movement$-970.7 m
- Average income of an arriving household$144,254
- Average income of a leaving household$148,447
- Largest single originNassau County (8,118 households)
- Largest single destinationNassau County (4,025 households)
| Origin | Households | People | Adjusted gross income |
|---|---|---|---|
| Nassau County | 8,118 | 13,835 | $966.4 m |
| Queens County | 4,540 | 8,701 | $386.6 m |
| Kings County | 1,973 | 3,523 | $260.1 m |
| New York County | 1,651 | 2,638 | $851.9 m |
| Bronx County | 459 | 799 | $32.6 m |
| Westchester County | 350 | 562 | $135.7 m |
| Palm Beach County | 276 | 388 | $44.3 m |
| Los Angeles County | 196 | 294 | $48.1 m |
Households arriving report $4,193 less average income than households leaving, which drains spending power even where headcount holds up. The largest single source of arrivals is Nassau County, which is the catchment a retail or multifamily study should look at first.
US Internal Revenue Service, Statistics of Income county migration flows, 2021 to 2022 filing years.
Suffolk County
What is the Suffolk County economy?
- County GDP, 2024$139.01 bn
- County GDP, 2023$131.32 bn
- GDP change, 2023 to 20245.9 percent
- GDP change over five years28.7 percent
- Rank by GDP among the New York areas BEA publishes4th of 62
- Rank by GDP among the US county areas BEA publishes35th of 3,127
- GDP per resident$90,850
Output grew 5.9 percent in the latest year and 28.7 percent over five, which is the trend line a lender will read behind any single year figure.
US Bureau of Economic Analysis, Regional, table CAGDP2, CAGDP2, through 2024.
Suffolk County
Employment by industry in Suffolk County
- Covered employment, annual average679,594
- Establishments reporting56,343
- Average annual pay$79,121
- Average weekly wage$1,522
- Health care and social assistance, employment101,618
- Health care and social assistance, average annual pay$74,532
- Retail trade, employment73,514
- Retail trade, average annual pay$49,088
- Accommodation and food services, employment55,158
- Accommodation and food services, average annual pay$34,481
- Manufacturing, employment50,905
- Manufacturing, average annual pay$86,925
- Administrative and support and waste management services, employment48,759
- Construction, employment47,437
| Sector | Employment | Establishments | Average annual pay |
|---|---|---|---|
| Health care and social assistance | 101,618 | 5,093 | $74,532 |
| Retail trade | 73,514 | 5,738 | $49,088 |
| Accommodation and food services | 55,158 | 3,905 | $34,481 |
| Manufacturing | 50,905 | 1,851 | $86,925 |
| Administrative and support and waste management services | 48,759 | 4,485 | $67,574 |
| Construction | 47,437 | 7,582 | $88,821 |
| Professional, scientific and technical services | 39,264 | 6,109 | $102,231 |
| Wholesale trade | 34,096 | 2,814 | $96,337 |
Health care and social assistance is the largest private sector at 101,618 jobs, 15.0 percent of covered employment.
US Bureau of Labor Statistics, Quarterly Census of Employment and Wages, 2024 annual averages.
Suffolk County
How many businesses are in Suffolk County?
- Establishments, all industries50,748
- Employment at those establishments592,580
- Annual payroll$39.33 bn
- Establishments per 1,000 residents33.2
These are counts of establishments physically operating in the county, not listings, so they are the supply side a feasibility study measures demand against. County Business Patterns counts private establishments with paid employees in March 2023, while the Quarterly Census of Employment and Wages above counts every unemployment-insured employer, public ones included, as a 2024 annual average, so the two establishment and employment counts differ.
US Census Bureau, County Business Patterns, 2023.
Suffolk County
Building permits in Suffolk County
- Housing units authorized by permit, 20241,407
- Declared construction value permitted$914.1 m
- Single family units authorized1,137
- Multifamily units authorized270
- Multifamily share of units19.2 percent
- Average declared value per unit$649,683
- Units authorized per 1,000 households2.7
Single-family homes are 80.8 percent of units authorized, so the pipeline is predominantly single-family.
US Census Bureau, Building Permits Survey, 2024 annual.
Suffolk County
SBA loans in Suffolk County (7(a) and 504)
- 7(a) approvals recorded2,394
- 7(a) gross approval dollars$993.2 m
- Average 7(a) approval$414,885
- Median 7(a) approval$150,000
- 10th percentile approval$25,000
- 90th percentile approval$1,058,800
- Largest single approval$5,000,000
- Jobs reported supported, 7(a)21,395
- Jobs per approval8.9
- Distinct 7(a) lenders active129
- Distinct industries receiving approvals398
- Median 7(a) term120 months
- Share of loans on real estate terms, 240 months or longer9.4 percent
- Loans on real estate terms224
- Loans on working capital terms, 120 months or shorter2,106
- Franchise loans156
- Franchise share of approvals6.5 percent
- Leading industry by approval countFull-Service Restaurants (95)
- Most active lenderTD Bank, National Association (580)
- 504 approvals recorded505
- 504 gross approval dollars$543.7 m
- Average 504 approval$1,076,578
- Median 504 approval$713,000
- Distinct CDCs active3
- 504 jobs per approval7.9
- 504 jobs per million dollars approved7.3
- Most active CDCEmpire State Certified Development Corporation (477)
- Combined SBA approval dollars, 7(a) FY2020 to FY2026 and 504 FY2010 to FY2026$1.54 bn
The average approval of $414,885 sits well above the median of $150,000, pulled up by a few larger deals, so the median is the better guide to what a typical borrower here gets. Only 9.4 percent of approvals run on real estate terms, so SBA credit here is mostly working capital and equipment rather than property acquisition.
US Small Business Administration, 7(a) FOIA release, FY2020 to FY2026 year to date, as of 2026-06-30. US Small Business Administration, 504 FOIA release, FY2010 to FY2026 year to date, as of 2026-06-30.
Suffolk County
SBA loan default and charge-off rates in Suffolk County
Do SBA loans in Suffolk County get paid back?
- Loans with a final outcome recorded379
- Paid in full296
- Charged off83
- Charge-off rate on resolved loans21.9 percent
- Status: Exempt from disclosure1,535
- Status: Paid in full296
- Status: Charged off83
- Status: Cancelled330
- Status: Committed, not yet disbursed150
Of the 379 loans that have reached a final outcome, 21.9 percent were charged off. This is computed only over resolved loans, because a loan still running has not yet succeeded or failed and counting it either way would be wrong.
Compare against the national and state SBA charge-off rates, computed the same way over resolved loans only.
US Small Business Administration, 7(a) FOIA release, FY2020 to FY2026 year to date, as of 2026-06-30.
Suffolk County
SBA lending by place in Suffolk County
- Borrower cities with recorded lending124
- Ronkonkoma, approvals91
- Bay Shore, approvals86
- Deer Park, approvals79
- Huntington, approvals74
- Smithtown, approvals73
- Huntington Station, approvals66
| Borrower city | Approvals | Gross approval dollars |
|---|---|---|
| Ronkonkoma | 91 | $42,563,300 |
| Bay Shore | 86 | $46,233,400 |
| Deer Park | 79 | $31,248,400 |
| Huntington | 74 | $36,205,500 |
| Smithtown | 73 | $25,776,100 |
| Huntington Station | 66 | $21,330,700 |
| Bohemia | 62 | $38,845,900 |
| Melville | 62 | $20,497,300 |
| 116 other borrower cities | 1,801 | $730,533,200 |
Ronkonkoma accounts for 91 approvals against 86 in Bay Shore. County level figures average over that gap, which is why a site decision is made at the submarket rather than the county.
US Small Business Administration, 7(a) FOIA release, FY2020 to FY2026 year to date, as of 2026-06-30.
Suffolk County
How large is Suffolk County?
- Land area912 sq mi
- Rank by land area among New York counties20th of 62
- Width, east to west85.7 mi
- Height, north to south47 mi
- Geographies sharing a boundary1
- Residents per square mile of land1,678
- Establishments per square mile55.64
US Census Bureau county boundary geometry, TIGER, adjacency computed from shared boundary vertices, TIGER county boundaries. US Census Bureau, American Community Survey 5-Year Estimates, 2020-2024 5-year. US Census Bureau, County Business Patterns, 2023.
Suffolk County
Flood risk in Suffolk County
- Communities in the county in the NFIP Community Status Book43
- Of those, participating in the NFIP43
- NFIP participation rate100.0 percent
- Best Community Rating System class in the county A lower CRS class is a larger flood insurance premium discount.Class 10
- Communities carrying a CRS class5
- Radon levels in Suffolk County, EPA zone predicted average indoor radon screening level less than 2 pCi/LZone 3
The EPA places Suffolk County in radon zone 3, a predicted average indoor radon screening level less than 2 pCi/L. The zone is a screening prediction for the county and does not substitute for a test at an address. The best Community Rating System class among the county's communities is 10, which carries a flood insurance premium discount for policies written in that community. 100.0 percent of the county's listed communities participate in the National Flood Insurance Program, per Federal Emergency Management Agency, NFIP Community Status Book (OpenFEMA), as of 2026-09-26.
Federal Emergency Management Agency, NFIP Community Status Book (OpenFEMA), as of 2026-09-26. US EPA, Map of Radon Zones, county spreadsheet, 2024-05 publication, EPA 402/A-16/001.
Coverage
What this page does not hold.
Traffic counts, zoning and the flood zone at an address are not on this page; they resolve at the address in the platform. How this page was built →
Feasibility studies
When a Suffolk County site needs a document a lender will accept.
The same data layer behind this page is the one the studies are written from. A study for a Suffolk County site starts with the figures you are reading, carrying the same source and period into the credit file.
- Population, American Community Survey 2020-20241,530,146
- Households512,565
- Average household size2.99
- Median household income$130,686
- Median age41.7
Common questions
Suffolk County questions, answered from the record.
How many people live in Suffolk County, New York?
The Census Bureau estimates 1,535,909 residents on July 1, 2024 (US Census Bureau, Population Estimates Program, Vintage 2024). The American Community Survey 2020-2024 five-year estimate is 1,530,146, in 512,565 households, ranking 4th of 62 New York counties. Source: US Census Bureau, American Community Survey 5-Year Estimates, 2020-2024 5-year.
Is Suffolk County's population growing?
The population has grown 0.66 percent since the 2020 census base of 1,525,913, to 1,535,909 on July 1, 2024. In 2024 there were 16,207 births against 12,813 deaths, with net migration of 3,412. Source: US Census Bureau, Population Estimates Program, Vintage 2024, Vintage 2024, estimates 2020 to 2024.
What is the median household income in Suffolk County?
$130,686. The median owner-occupied home is valued at $578,400, which is 4.4 times income, and median gross rent is $2,255 per month. Source: US Census Bureau, American Community Survey 5-Year Estimates, 2020-2024 5-year.
How many businesses are in Suffolk County?
50,748 establishments, employing 592,580 people with an annual payroll of $39.33 bn. These are establishments physically operating in the county, not listings. Source: US Census Bureau, County Business Patterns, 2023.
What is employment by industry in Suffolk County?
Health care and social assistance is the largest private sector at 101,618 jobs, 15.0 percent of covered employment. Covered employment averages 679,594 jobs at an average annual pay of $79,121, or $1,522 a week. Source: US Bureau of Labor Statistics, Quarterly Census of Employment and Wages, 2024 annual averages.
How much SBA lending happens in Suffolk County?
2,394 7(a) approvals totaling $993.2 m since FY2020, across 129 lenders, with a median approval of $150,000, plus 505 504 approvals worth $543.7 m since FY2010. These are approvals recorded in the release, not loans disbursed.
Do SBA loans in Suffolk County get paid back?
Of the 379 loans that have reached a final outcome, 296 were paid in full and 83 charged off, a charge-off rate of 21.9 percent. Loans still running are excluded, because they have not yet succeeded or failed.
How many building permits were issued in Suffolk County?
1,407 housing units were authorized by permit in 2024, with a declared construction value of $914.1 m. Multifamily was 19.2 percent of units. Source: US Census Bureau, Building Permits Survey, 2024 annual.
What is the radon zone for Suffolk County?
Zone 3, a predicted average indoor radon screening level less than 2 pCi/L. Source: US EPA, Map of Radon Zones, county spreadsheet, 2024-05 publication, EPA 402/A-16/001.
Where do people moving to Suffolk County come from?
The largest single origin is Nassau County, with 8,118 households. Arriving households report an average income of $144,254 against $148,447 for those leaving. Source: US Internal Revenue Service, Statistics of Income county migration flows, 2021 to 2022 filing years.
Are traffic counts available for Suffolk County on this page?
No. Annual average daily traffic resolves in the platform rather than in this dataset, so no AADT figure is printed here. It is a gap we know about rather than a figure we estimated.
Is zoning published for Suffolk County?
No. Nothing on this page presents parcel level zoning, and where a statutory framework applies it is marked as the statewide frame, to be confirmed locally.
Suffolk County
Cities and places in Suffolk.
159 Census places lie wholly or partly in Suffolk County. All 159 carry enough published place level data for a page of their own and are linked.
| Place | Type | Population | SBA 7(a) approvals, projects in this county | Lies in |
|---|---|---|---|---|
| West Babylon | CDP | 43,570 | 61 | Wholly in this county |
| Coram | CDP | 39,539 | 40 | Wholly in this county |
| Central Islip | CDP | 38,373 | 20 | Wholly in this county |
| Commack | CDP | 36,558 | 60 | Wholly in this county |
| Huntington Station | CDP | 32,601 | 66 | Wholly in this county |
| Centereach | CDP | 31,839 | 25 | Wholly in this county |
| Bay Shore | CDP | 31,683 | 86 | Wholly in this county |
| Shirley | CDP | 28,375 | 24 | Wholly in this county |
| Deer Park | CDP | 27,990 | 79 | Wholly in this county |
| Lindenhurst | village | 27,142 | 48 | Wholly in this county |
| West Islip | CDP | 26,865 | 25 | Wholly in this county |
| Holbrook | CDP | 26,449 | 56 | Wholly in this county |
| Medford | CDP | 24,796 | 27 | Wholly in this county |
| Dix Hills | CDP | 24,773 | 23 | Wholly in this county |
| Smithtown | CDP | 24,375 | 73 | Wholly in this county |
| Copiague | CDP | 23,424 | 17 | Wholly in this county |
| East Patchogue | CDP | 21,673 | 5 | Wholly in this county |
| Selden | CDP | 21,604 | 18 | Wholly in this county |
| North Amityville | CDP | 21,138 | None recorded | Wholly in this county |
| Hauppauge | CDP | 20,793 | 56 | Wholly in this county |
| North Bay Shore | CDP | 20,282 | None recorded | Wholly in this county |
| Huntington | CDP | 19,948 | 74 | Wholly in this county |
| Melville | CDP | 19,714 | 62 | Wholly in this county |
| East Northport | CDP | 19,700 | 49 | Wholly in this county |
| Holtsville | CDP | 19,344 | 16 | Wholly in this county |
| Ronkonkoma | CDP | 18,709 | 91 | Wholly in this county |
| Lake Ronkonkoma | CDP | 18,221 | 6 | Wholly in this county |
| North Babylon | CDP | 17,963 | 16 | Wholly in this county |
| Islip | CDP | 17,362 | 22 | Wholly in this county |
| Mastic Beach | CDP | 16,735 | 5 | Wholly in this county |
| Kings Park | CDP | 16,516 | 22 | Wholly in this county |
| Farmingville | CDP | 16,160 | 32 | Wholly in this county |
| Mastic | CDP | 15,708 | 12 | Wholly in this county |
| Hampton Bays | CDP | 15,706 | 35 | Wholly in this county |
| Sayville | CDP | 15,408 | 33 | Wholly in this county |
| Greenlawn | CDP | 15,210 | 17 | Wholly in this county |
| Riverhead | CDP | 14,936 | 30 | Wholly in this county |
| Manorville | CDP | 14,233 | 13 | Wholly in this county |
| Nesconset | CDP | 13,833 | 19 | Wholly in this county |
| East Islip | CDP | 13,573 | 11 | Wholly in this county |
| Rocky Point | CDP | 13,356 | 14 | Wholly in this county |
| St. James | CDP | 13,244 | 28 | Wholly in this county |
| Stony Brook | CDP | 12,868 | 26 | Wholly in this county |
| Ridge | CDP | 12,503 | 10 | Wholly in this county |
| Patchogue | village | 12,396 | 55 | Wholly in this county |
| Babylon | village | 12,185 | 24 | Wholly in this county |
| Elwood | CDP | 11,762 | None recorded | Wholly in this county |
| Miller Place | CDP | 11,736 | 30 | Wholly in this county |
| Mount Sinai | CDP | 11,093 | 28 | Wholly in this county |
| North Bellport | CDP | 11,087 | None recorded | Wholly in this county |
| Lake Grove | village | 11,061 | 21 | Wholly in this county |
| Middle Island | CDP | 11,027 | 11 | Wholly in this county |
| North Lindenhurst | CDP | 10,952 | None recorded | Wholly in this county |
| Terryville | CDP | 10,794 | None recorded | Wholly in this county |
| Fort Salonga | CDP | 10,199 | 1 | Wholly in this county |
| East Setauket | CDP | 10,149 | 38 | Wholly in this county |
| South Huntington | CDP | 9,779 | 2 | Wholly in this county |
| Amityville | village | 9,588 | 33 | Wholly in this county |
| Stony Brook University | CDP | 9,530 | None recorded | Wholly in this county |
| Bohemia | CDP | 9,181 | 62 | Wholly in this county |
| Springs | CDP | 9,163 | None recorded | Wholly in this county |
| Center Moriches | CDP | 9,127 | 11 | Wholly in this county |
| Bayport | CDP | 8,921 | 9 | Wholly in this county |
| Wading River | CDP | 8,359 | 30 | Wholly in this county |
| Baywood | CDP | 8,176 | None recorded | Wholly in this county |
| Port Jefferson | village | 8,091 | 25 | Wholly in this county |
| Port Jefferson Station | CDP | 7,676 | 35 | Wholly in this county |
| Northport | village | 7,322 | 34 | Wholly in this county |
| East Shoreham | CDP | 7,321 | None recorded | Wholly in this county |
| Sound Beach | CDP | 7,210 | 4 | Wholly in this county |
| Oakdale | CDP | 7,115 | 17 | Wholly in this county |
| North Patchogue | CDP | 6,984 | None recorded | Wholly in this county |
| Yaphank | CDP | 6,934 | 17 | Wholly in this county |
| Flanders | CDP | 6,609 | None recorded | Wholly in this county |
| North Sea | CDP | 6,458 | None recorded | Wholly in this county |
| Southold | CDP | 6,397 | 11 | Wholly in this county |
| East Moriches | CDP | 6,260 | 9 | Wholly in this county |
| Centerport | CDP | 6,072 | 5 | Wholly in this county |
| East Hampton North | CDP | 6,006 | None recorded | Wholly in this county |
| East Farmingdale | CDP | 5,666 | None recorded | Wholly in this county |
| Calverton | CDP | 5,618 | 6 | Wholly in this county |
| East Quogue | CDP | 5,406 | 3 | Wholly in this county |
| West Hills | CDP | 5,369 | None recorded | Wholly in this county |
| Northwest Harbor | CDP | 5,205 | None recorded | Wholly in this county |
| Islip Terrace | CDP | 5,168 | 17 | Wholly in this county |
| West Sayville | CDP | 4,800 | 7 | Wholly in this county |
| Noyack | CDP | 4,782 | None recorded | Wholly in this county |
| Blue Point | CDP | 4,735 | 5 | Wholly in this county |
| Wheatley Heights | CDP | 4,729 | 4 | Wholly in this county |
| Southampton | village | 4,621 | 43 | Wholly in this county |
| Mattituck | CDP | 4,606 | 10 | Wholly in this county |
| Gordon Heights | CDP | 4,230 | None recorded | Wholly in this county |
| Montauk | CDP | 4,223 | 17 | Wholly in this county |
| West Bay Shore | CDP | 4,208 | None recorded | Wholly in this county |
| Setauket | CDP | 4,069 | 7 | Wholly in this county |
| Riverside | CDP | 4,038 | None recorded | Wholly in this county |
| North Great River | CDP | 3,909 | None recorded | Wholly in this county |
| Westhampton | CDP | 3,900 | 4 | Wholly in this county |
| Islandia | village | 3,600 | 17 | Wholly in this county |
| Lloyd Harbor | village | 3,565 | None recorded | Wholly in this county |
| Cold Spring Harbor | CDP | 3,220 | 5 | Wholly in this county |
| Brightwaters | village | 3,179 | 5 | Wholly in this county |
| Brookhaven | CDP | 2,858 | 6 | Wholly in this county |
| Cutchogue | CDP | 2,835 | 4 | Wholly in this county |
| Water Mill | CDP | 2,764 | 10 | Wholly in this county |
| Halesite | CDP | 2,661 | None recorded | Wholly in this county |
| Baiting Hollow | CDP | 2,614 | 3 | Wholly in this county |
| Greenport | village | 2,574 | 10 | Wholly in this county |
| Westhampton Beach | village | 2,574 | 19 | Wholly in this county |
| Shinnecock Hills | CDP | 2,545 | None recorded | Wholly in this county |
| Sag Harbor | village | 2,489 | 12 | Wholly in this county |
| Greenport West | CDP | 2,463 | None recorded | Wholly in this county |
| Eastport | CDP | 2,414 | 4 | Wholly in this county |
| Moriches | CDP | 2,308 | 8 | Wholly in this county |
| Shelter Island | CDP | 2,125 | 1 | Wholly in this county |
| Bellport | village | 1,948 | 19 | Wholly in this county |
| Northville | CDP | 1,912 | None recorded | Wholly in this county |
| Village of the Branch | village | 1,903 | None recorded | Wholly in this county |
| Great River | CDP | 1,899 | None recorded | Wholly in this county |
| Aquebogue | CDP | 1,869 | 5 | Wholly in this county |
| Huntington Bay | village | 1,693 | None recorded | Wholly in this county |
| Jamesport | CDP | 1,593 | 2 | Wholly in this county |
| Remsenburg-Speonk | CDP | 1,564 | None recorded | Wholly in this county |
| Bridgehampton | CDP | 1,531 | 6 | Wholly in this county |
| Nissequogue | village | 1,528 | None recorded | Wholly in this county |
| Head of the Harbor | village | 1,384 | None recorded | Wholly in this county |
| Laurel | CDP | 1,360 | 3 | Wholly in this county |
| East Marion | CDP | 1,331 | None recorded | Wholly in this county |
| East Hampton | village | 1,297 | 21 | Wholly in this county |
| Tuckahoe | CDP | 1,249 | None recorded | Wholly in this county |
| Shelter Island Heights | CDP | 1,230 | None recorded | Wholly in this county |
| Eatons Neck | CDP | 1,173 | None recorded | Wholly in this county |
| Poquott | village | 1,127 | None recorded | Wholly in this county |
| Orient | CDP | 1,121 | None recorded | Wholly in this county |
| Old Field | village | 1,007 | None recorded | Wholly in this county |
| North Haven | village | 967 | None recorded | Wholly in this county |
| Quiogue | CDP | 941 | None recorded | Wholly in this county |
| Peconic | CDP | 848 | None recorded | Wholly in this county |
| Amagansett | CDP | 821 | 5 | Wholly in this county |
| Asharoken | village | 805 | None recorded | Wholly in this county |
| Quogue | village | 760 | 3 | Wholly in this county |
| Belle Terre | village | 740 | None recorded | Wholly in this county |
| Wainscott | CDP | 612 | 4 | Wholly in this county |
| Shoreham | village | 537 | 3 | Wholly in this county |
| Northampton | CDP | 499 | None recorded | Wholly in this county |
| Fire Island | CDP | 352 | None recorded | Wholly in this county |
| Sagaponack | village | 303 | 3 | Wholly in this county |
| New Suffolk | CDP | 298 | None recorded | Wholly in this county |
| Captree | CDP | 282 | None recorded | Wholly in this county |
| Gilgo | CDP | 148 | None recorded | Wholly in this county |
| West Hampton Dunes | village | 107 | None recorded | Wholly in this county |
| Fishers Island | CDP | 72 | None recorded | Wholly in this county |
| Napeague | CDP | 70 | None recorded | Wholly in this county |
| Oak Beach | CDP | 69 | 1 | Wholly in this county |
| Ocean Beach | village | 24 | 1 | Wholly in this county |
| Saltaire | village | 8 | None recorded | Wholly in this county |
| Dering Harbor | village | 0 | None recorded | Wholly in this county |
| Brentwood | CDP | Not published | 31 | Wholly in this county |
| Wyandanch | CDP | Not published | 14 | Wholly in this county |
A further 82 of the county's 2,394 SBA 7(a) approvals are to borrowers in cities that match no Census place in Suffolk County, the largest being Farmingdale (58), Speonk (3), Greenvale (2). Those are postal cities, unincorporated areas and cities outside the county, so no place row claims them; they are counted in the county total above.
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