HomeIllinoisSangamon CountyWilliamsville
Williamsville, Illinois: commercial real estate data.
Williamsville is a Census village of 1,314 people across 1.55 square miles of land, in Sangamon County. Median household income is $106,731, 88.1 percent of occupied homes are owned.
Underlined figures are computed by MMCG Analytics, not published by the agency.
Williamsville
What Williamsville is
- Census place typevillage
- Land area1.55 sq mi
- Water area0.03 sq mi
- Population per square mile of land849 plus or minus 203
- County holding the largest share of its areaSangamon County, 100.0 percent
US Census Bureau, cartographic boundary file, places, 2024 vintage. US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Williamsville
How many people live in Williamsville
- Population1,314 plus or minus 315
- Median age43.4
- Population under 18342 plus or minus 88
- Share under 1826.0 percent
- Population 65 and over237 plus or minus 80
- Share 65 and over18.0 percent plus or minus 4.3
- Households530 plus or minus 126
- Family households390 plus or minus 101
- Share of households that are families73.6 percent
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Williamsville
Income and work in Williamsville
- Median household income$106,731
- Per capita income$49,846
- Civilian labor force680 plus or minus 162
- Employed673 plus or minus 159
- Unemployed7 plus or minus 9
- Unemployment rate1.0 percent plus or minus 1.3
- Adults 25 and over891 plus or minus 211
- Adults 25 and over with a high school diploma or higher92.0 percent plus or minus 26.6
- Adults 25 and over with a bachelor degree or higher45.2 percent
- Adults 25 and over with a graduate degree16.0 percent plus or minus 4.3
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Williamsville
Housing in Williamsville
- Housing units542 plus or minus 127
- Occupied units530 plus or minus 126
- Vacant units12 plus or minus 16
- Vacancy rate2.2 percent plus or minus 2.9
- Owner occupied467 plus or minus 117
- Renter occupied63 plus or minus 36
- Ownership rate88.1 percent
- Median owner-occupied home value$199,300
- Median gross rent, monthly$943 plus or minus $204
- Annual rent as a share of median income10.6 percent plus or minus 2.9
- Single family units510 plus or minus 117
- Share single family94.1 percent plus or minus 30.9
- Units in buildings of two or more30 plus or minus 24
- Share in buildings of two or more5.5 percent plus or minus 4.3
- Mobile homes0
- Median year structure built1976
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Williamsville
How Williamsville gets to work
- Workers 16 and over who commute542 plus or minus 143
- Commuting under 15 minutes114 plus or minus 54
- Share commuting under 15 minutes21.0 percent plus or minus 8.2
- Commuting 30 minutes or more139 plus or minus 49
- Share commuting 30 minutes or more25.6 percent plus or minus 6.1
- Drove alone76.9 percent
- Carpooled5.6 percent plus or minus 3.8
- Public transport0.0 percent
- Walked0.5 percent plus or minus 0.8
- Worked from home15.8 percent plus or minus 4.7
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Williamsville
SBA loans in Williamsville (504)
- Approvals1
- Gross approval$254,000
- Average approval$254,000
- Median approval$254,000
- Largest approval$254,000
- Jobs supported1
- Loans with a final outcome0
- Charged off0
- Median term300 months
- Distinct CDCs1
Counted by borrower city: approvals to borrowers whose address is in Williamsville, in any county, FY2010 to FY2026. Only 0 loans have reached a final outcome, fewer than the 30 a charge-off rate needs, so no rate is published.
US Small Business Administration, 504 FOIA release, FY2010 to FY2026 year to date, as of 2026-06-30.
Williamsville
Flood risk in Williamsville
- NFIP communityVillage of Williamsville
- NFIP community number171041
- Participating in the NFIPYes
- Community Rating System classNone
- Currently effective map date08/02/07
The Village of Williamsville participates in the National Flood Insurance Program as community 171041 and carries no Community Rating System class, so no CRS premium discount applies to it.
Federal Emergency Management Agency, NFIP Community Status Book (OpenFEMA), as of 2026-09-26.
Sangamon County, not Williamsville
Sangamon County context, not Williamsville figures
- Establishments in Sangamon County4,925
- Covered employment, Sangamon County134,376
- Average annual pay, Sangamon County$69,350
- Housing units permitted, Sangamon County191
Every figure in this section is published for Sangamon County as a whole and is not a measurement of Williamsville.
US Census Bureau, County Business Patterns, 2023. US Bureau of Labor Statistics, Quarterly Census of Employment and Wages, 2024 annual averages. US Census Bureau, Building Permits Survey, 2024 annual.
Coverage
What this page does not hold.
Parcel detail, 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 →
Common questions
Williamsville questions, answered from the record.
How many people live in Williamsville, Illinois?
1,314, in 530 households. Williamsville village covers 1.55 square miles of land, which is 849 people per square mile. Source: US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
What county is Williamsville in?
Sangamon County, which holds 100.0 percent of the place by area. Source: US Census Bureau, cartographic boundary file, places, 2024 vintage.
What is the median household income in Williamsville?
$106,731. The median owner-occupied home is valued at $199,300. Median gross rent is $943 per month. Source: US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Is Williamsville in the National Flood Insurance Program?
Yes. Williamsville appears in the FEMA Community Status Book as Williamsville, village of, community 171041, with no Community Rating System class, so no CRS discount applies. Whether a specific parcel sits in a mapped special flood hazard area is an address level question the platform answers.
Are the county figures on this page Williamsville figures?
No, and they are labeled so. County Business Patterns, QCEW, the Building Permits Survey, BEA product and IRS migration are published for Sangamon County as a whole and there is no place level equivalent. They appear in one clearly marked section as context and are never presented as measurements of Williamsville.
Is zoning published for Williamsville?
No. Nothing on this page presents parcel level zoning.