Village · Illinois
Dahlgren, Illinois
Dahlgren, village, in Hamilton County, Illinois. Dahlgren had 495 residents on July 1, 2025 by the Census Bureau's estimate, down 1.6% since 2020; the 2020 Census counted 504 and the ACS 2020-2024 5-year estimates put it at 595 (±203). GEOID 1718303.
Residents, July 2025 estimate
495
Census Bureau estimate (no margin published)
2020 Census count: 504 · ACS 2020-2024: 595 ±203
Median household income
$44,861
±$22,870 (90% margin)
Illinois: $83,390
Median home value
$80,800
±$24,244 (90% margin)
Illinois: $263,300
Median gross rent
$557
±$506 (90% margin)
Illinois: $1,274
Where is Dahlgren and what county is it in?
Dahlgren is a village in Hamilton County, Illinois. It covers 1.0 square miles of land, 496 residents per square mile in 2020.
Dahlgren lies entirely within Dahlgren Township, a township with its own local government (2020 census blocks).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Dahlgren, and is it growing?
The Census Bureau estimates that 495 people lived in Dahlgren on July 1, 2025, down 1.6% since 2020, a steeper fall than Illinois's (−0.8%). The 2020 Census counted 504 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 595 (±203).
| Measure | Dahlgren | Hamilton County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 595 ±203 | 7,916 | no clear change |
| Households | 227 ±67 | 3,387 | no clear change |
| Average household size | 2.62 ±0.63 | 2.30 | no clear change |
| Housing units | 244 ±70 | 3,803 | no clear change |
Dahlgren's population since 2000
From 514 in 2000 to 495 in 2025: down 3.7%. The 2000, 2010 and 2020 figures are census counts, each for Dahlgren as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Dahlgren?
The median resident of Dahlgren is 25.1 years old; 39.7% are under 18 and 14.3% are 65 or older. The largest group is non-Hispanic white residents at 98.8%, then non-Hispanic Asian residents at 1.2%.
| Measure | Dahlgren | Hamilton County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 25.1 ±7.6 | 43.9 | −21.4 |
| Under 18 years | 39.7% ±11.7 pts | 21.9% | – |
| 65 years and over | 14.3% ±7.5 pts | 22.9% | – |
| Male | 47.2% ±8.1 pts | 49.9% | – |
| Hispanic or Latino (any race) | 0.0% ±6.1 pts | 0.7% | – |
| White alone, not Hispanic | 98.8% ±2.5 pts | 94.7% | no clear change |
| Black or African American alone, not Hispanic | 0.0% ±6.1 pts | 0.2% | – |
| Asian alone, not Hispanic | 1.2% ±2.5 pts | 0.5% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±6.1 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±6.1 pts | 0.1% | – |
| Two or more races, not Hispanic | 0.0% ±6.1 pts | 3.2% | – |
| Some other race alone, not Hispanic | 0.0% ±6.1 pts | 0.4% | – |
| Born outside the United States | 0.5% ±1.0 pts | 0.5% | – |
| Speak a language other than English at home (age 5+) | 1.9% ±3.0 pts | 1.9% | – |
| Civilian veterans (age 18+) | 8.6% ±5.7 pts | 7.7% | – |
| With a disability | 17.5% ±8.4 pts | 19.2% | – |
| No health insurance coverage | 9.2% ±9.8 pts | 7.6% | – |
| High school graduate or higher (age 25+) | 95.7% ±3.5 pts | 91.7% | – |
| Bachelor's degree or higher (age 25+) | 5.0% ±3.9 pts | 21.0% | – |
| Graduate or professional degree (age 25+) | 0.0% ±11.7 pts | 8.6% | – |
| Lived in the same house a year earlier | 88.1% ±10.7 pts | 92.5% | – |
| Moved from another state in the past year | 1.4% ±2.1 pts | 1.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Dahlgren earn?
Half of Dahlgren's 227 households earn less than $44,861 a year (±$22,870), against $65,746 in Hamilton County and $83,390 in Illinois. In 2015-2019 it was $54,099 in 2024 dollars; the margins of error cannot tell the two periods apart. 22.0% of residents live below the poverty line.
| Measure | Dahlgren | Hamilton County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $44,861 ±$22,870 | $65,746 | no clear change |
| Mean household income | $50,589 ±$9,834 | $92,896 | – |
| Per capita income | $19,094 ±$6,291 | $39,790 | no clear change |
| People below the poverty line | 22.0% ±12.6 pts | 12.1% | – |
| Children under 18 below the poverty line | 21.2% ±21.8 pts | 15.7% | – |
| Households receiving SNAP | 40.1% ±16.1 pts | 15.2% | – |
| Households with a computer | 89.0% ±9.4 pts | 85.1% | – |
| Households with a broadband subscription | 82.4% ±11.8 pts | 80.7% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Dahlgren?
Owners occupy 79.7% of Dahlgren's occupied homes and renters 20.3%. The median owner-occupied home is valued at $80,800 by its owner (±$24,244).
| Measure | Dahlgren | Hamilton County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $80,800 ±$24,244 | $113,700 | no clear change |
| Median gross rent | $557 ±$506 | $568 | – |
| Renters paying 35% or more of income on rent | 35.7% ±38.0 pts | 19.0% | – |
| Median monthly owner costs, with a mortgage | $798 ±$317 | $1,167 | – |
| Owner-occupied homes | 79.7% ±11.8 pts | 76.4% | no clear change |
| Renter-occupied homes | 20.3% ±11.8 pts | 23.6% | – |
| Housing units | 244 ±70 | 3,803 | no clear change |
| Homeowner vacancy rate | 0.0% ±17.9 pts | 1.4% | – |
| Rental vacancy rate | 0.0% ±47.0 pts | 0.0% | – |
| Single-family detached homes | 72.5% ±12.0 pts | 76.7% | – |
| Mobile homes | 21.7% ±10.7 pts | 16.4% | – |
| Built 2020 or later | 2.0% ±2.7 pts | 0.7% | – |
| Built 2010 to 2019 | 6.6% ±6.2 pts | 7.8% | – |
| Built 1939 or earlier | 44.7% ±13.9 pts | 16.1% | – |
| Households with no vehicle | 8.4% ±9.9 pts | 5.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Dahlgren work and get to work?
90.4% of Dahlgren's workers drive alone. The average trip to work takes 25.8 minutes.
| Measure | Dahlgren | Hamilton County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 59.1% ±12.5 pts | 58.7% | – |
| Unemployment rate | 3.3% ±3.9 pts | 5.1% | – |
| Drove alone to work | 90.4% ±7.8 pts | 89.7% | – |
| Carpooled | 3.8% ±4.8 pts | 6.1% | – |
| Public transportation | 1.0% ±2.3 pts | 0.6% | – |
| Walked | 0.0% ±16.4 pts | 0.9% | – |
| Worked from home | 4.8% ±4.6 pts | 2.4% | – |
| Mean travel time to work | 25.8 min ±6.4 | 26.8 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Dahlgren?
No census tract lies mostly in Dahlgren; 1 tract reaches into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 9733Hamilton County | 2,713 | $75,949 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Dahlgren) · Census block assignment files
How does Dahlgren compare with other places in Illinois?
By the Census Bureau's July 2025 estimates, Dahlgren is the 13,240th-most populous of the 19,476 U.S. incorporated places that have one and the 867th-most populous of 1,294 in Illinois.
Dahlgren is not ranked by income or the other survey measures: those rankings include places of 1,000 or more residents (2020 Census) with a reliable estimate.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 867th | 1,294 |
Dahlgren's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Dahlgren with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Dahlgren?
27 of the 57 figures for Dahlgren on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Dahlgren are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Dahlgren.