HomeIllinoisDeKalb CountySomonauk
Somonauk, Illinois: commercial real estate data.
Somonauk is a Census village of 1,569 people across 2.50 square miles of land, lying across DeKalb County and LaSalle County. Median household income is $84,583, 73.9 percent of occupied homes are owned.
Underlined figures are computed by MMCG Analytics, not published by the agency.
Somonauk
What Somonauk is
- Census place typevillage
- Land area2.5 sq mi
- Water area0.01 sq mi
- Population per square mile of land627
- County holding the largest share of its areaDeKalb County, 85.0 percent
- Counties this place lies inDeKalb County 85.0 percent, LaSalle County 15.0 percent
Somonauk crosses a county line. The split above is measured from the Census boundary of the place against the county boundaries, by area, so it says where the ground is and not where the town hall is.
US Census Bureau, cartographic boundary file, places, 2024 vintage. US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Somonauk
How many people live in Somonauk
- Population1,569
- Median age45.6
- Population under 18321 plus or minus 67
- Share under 1820.5 percent
- Population 65 and over402 plus or minus 96
- Share 65 and over25.6 percent
- Households659
- Family households452
- Share of households that are families68.6 percent
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Somonauk
Income and work in Somonauk
- Median household income$84,583 plus or minus $19,599
- Per capita income$45,767
- Civilian labor force734
- Employed696
- Unemployed38 plus or minus 21
- Unemployment rate5.2 percent plus or minus 2.7
- Adults 25 and over1,122
- Adults 25 and over with a high school diploma or higher95.7 percent plus or minus 19.5
- Adults 25 and over with a bachelor degree or higher22.7 percent plus or minus 4.9
- Adults 25 and over with a graduate degree8.1 percent plus or minus 2.3
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Somonauk
Housing in Somonauk
- Housing units677
- Occupied units659
- Vacant units18 plus or minus 25
- Vacancy rate2.7 percent plus or minus 3.7
- Owner occupied487
- Renter occupied172 plus or minus 43
- Ownership rate73.9 percent
- Median owner-occupied home value$234,400
- Median gross rent, monthly$993
- Annual rent as a share of median income14.1 percent plus or minus 4.0
- Single family units596
- Share single family88.0 percent
- Units in buildings of two or more81 plus or minus 36
- Share in buildings of two or more12.0 percent plus or minus 5.0
- Mobile homes0
- Median year structure built1973
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Somonauk
How Somonauk gets to work
- Workers 16 and over who commute638
- Commuting under 15 minutes205 plus or minus 56
- Share commuting under 15 minutes32.1 percent plus or minus 7.1
- Commuting 30 minutes or more305 plus or minus 64
- Share commuting 30 minutes or more47.8 percent
- Drove alone85.1 percent
- Carpooled4.1 percent plus or minus 2.7
- Public transport0.0 percent
- Walked2.6 percent plus or minus 2.4
- Worked from home6.9 percent plus or minus 3.0
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Somonauk
SBA loans in Somonauk (504)
- Approvals1
- Gross approval$112,000
- Average approval$112,000
- Median approval$112,000
- Largest approval$112,000
- Jobs supported4
- Loans with a final outcome0
- Charged off0
- Median term300 months
- Distinct CDCs1
Counted by borrower city: approvals to borrowers whose address is in Somonauk, 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.
Somonauk
Flood risk in Somonauk
- NFIP communityVillage of Somonauk
- NFIP community number170190
- Participating in the NFIPYes
- Community Rating System classNone
- Currently effective map date07/18/11(M)
The Village of Somonauk participates in the National Flood Insurance Program as community 170190 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.
DeKalb County, not Somonauk
DeKalb County context, not Somonauk figures
- Establishments in DeKalb County1,975
- Covered employment, DeKalb County36,272
- Average annual pay, DeKalb County$56,896
- Housing units permitted, DeKalb County257
Every figure in this section is published for DeKalb County as a whole and is not a measurement of Somonauk.
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
Somonauk questions, answered from the record.
How many people live in Somonauk, Illinois?
1,569, in 659 households. Somonauk village covers 2.50 square miles of land, which is 627 people per square mile. Source: US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
What county is Somonauk in?
Somonauk lies in more than one. By area it is 85.0 percent in DeKalb County, 15.0 percent in LaSalle County. This page sits under DeKalb County because that county holds the largest share. The split is measured from the Census boundary of the place against the county boundaries.
What is the median household income in Somonauk?
$84,583. The median owner-occupied home is valued at $234,400. Median gross rent is $993 per month. Source: US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Is Somonauk in the National Flood Insurance Program?
Yes. Somonauk appears in the FEMA Community Status Book as Somonauk, village of, community 170190, 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 Somonauk figures?
No, and they are labeled so. County Business Patterns, QCEW, the Building Permits Survey, BEA product and IRS migration are published for DeKalb 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 Somonauk.
Is zoning published for Somonauk?
No. Nothing on this page presents parcel level zoning.
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