City · Illinois
Lanark, Illinois
Lanark, city, in Carroll County, Illinois. Lanark had 1,452 residents on July 1, 2025 by the Census Bureau's estimate, down 3.9% since 2020; the 2020 Census counted 1,504 and the ACS 2020-2024 5-year estimates put it at 1,541 (±249). GEOID 1741859.
Residents, July 2025 estimate
1,452
Census Bureau estimate (no margin published)
2020 Census count: 1,504 · ACS 2020-2024: 1,541 ±249
Median household income
$59,375
±$18,480 (90% margin)
Illinois: $83,390
Median home value
$96,600
±$2,369 (90% margin)
Illinois: $263,300
Median gross rent
$819
±$105 (90% margin)
Illinois: $1,274
Where is Lanark and what county is it in?
Lanark is a city in Carroll County, Illinois. It covers 1.1 square miles of land, 1,342 residents per square mile in 2020.
Lanark lies entirely within Rock Creek-Lima 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 Lanark, and is it growing?
The Census Bureau estimates that 1,452 people lived in Lanark on July 1, 2025, down 3.9% since 2020, a steeper fall than Illinois's (−0.8%). The 2020 Census counted 1,504 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 1,541 (±249).
| Measure | Lanark | Carroll County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 1,541 ±249 | 15,576 | no clear change |
| Households | 702 ±115 | 6,578 | no clear change |
| Average household size | 2.18 ±0.20 | 2.12 | no clear change |
| Housing units | 814 ±120 | 8,204 | no clear change |
Lanark's population since 2000
From 1,584 in 2000 to 1,452 in 2025: down 8.3%. The 2000, 2010 and 2020 figures are census counts, each for Lanark 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 Lanark?
The median resident of Lanark is 38.4 years old; 24.3% are under 18 and 21.5% are 65 or older. The largest group is non-Hispanic white residents at 93.5%, then Hispanic or Latino residents (of any race) at 4.3%.
| Measure | Lanark | Carroll County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 38.4 ±3.9 | 45.4 | no clear change |
| Under 18 years | 24.3% ±4.2 pts | 17.7% | – |
| 65 years and over | 21.5% ±5.9 pts | 24.2% | – |
| Male | 53.1% ±4.7 pts | 54.9% | – |
| Hispanic or Latino (any race) | 4.3% ±2.6 pts | 5.3% | – |
| White alone, not Hispanic | 93.5% ±3.2 pts | 87.8% | no clear change |
| Black or African American alone, not Hispanic | 0.1% ±0.1 pts | 3.9% | – |
| Asian alone, not Hispanic | 0.0% ±2.4 pts | 0.8% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±2.4 pts | 0.3% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±2.4 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.1% ±2.3 pts | 1.7% | – |
| Some other race alone, not Hispanic | 0.0% ±2.4 pts | 0.2% | – |
| Born outside the United States | 0.3% ±0.4 pts | 2.4% | – |
| Speak a language other than English at home (age 5+) | 1.0% ±0.7 pts | 6.0% | – |
| Civilian veterans (age 18+) | 4.3% ±2.0 pts | 8.6% | – |
| With a disability | 12.8% ±3.3 pts | 16.2% | – |
| No health insurance coverage | 4.7% ±3.2 pts | 5.8% | – |
| High school graduate or higher (age 25+) | 95.9% ±2.3 pts | 88.9% | – |
| Bachelor's degree or higher (age 25+) | 14.5% ±4.2 pts | 17.8% | no clear change |
| Graduate or professional degree (age 25+) | 3.9% ±1.8 pts | 4.6% | – |
| Lived in the same house a year earlier | 89.0% ±6.3 pts | 90.2% | – |
| Moved from another state in the past year | 2.2% ±2.1 pts | 3.3% | – |
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 Lanark earn?
Half of Lanark's 702 households earn less than $59,375 a year (±$18,480), against $60,758 in Carroll County and $83,390 in Illinois. In 2015-2019 it was $55,227 in 2024 dollars; the margins of error cannot tell the two periods apart. 12.7% of residents live below the poverty line.
| Measure | Lanark | Carroll County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $59,375 ±$18,480 | $60,758 | no clear change |
| Mean household income | $79,076 ±$7,947 | $77,693 | – |
| Per capita income | $34,486 ±$3,292 | $32,110 | no clear change |
| People below the poverty line | 12.7% ±4.6 pts | 14.2% | no clear change |
| Children under 18 below the poverty line | 20.8% ±10.8 pts | 23.1% | no clear change |
| Households receiving SNAP | 23.5% ±7.2 pts | 15.1% | – |
| Households with a computer | 89.9% ±6.4 pts | 92.0% | – |
| Households with a broadband subscription | 86.6% ±6.4 pts | 86.1% | – |
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 Lanark?
Owners occupy 78.6% of Lanark's occupied homes and renters 21.4%. The median owner-occupied home is valued at $96,600 by its owner (±$2,369). The median renter pays $819 a month including utilities, and 26.2% of renters pay 35% or more of their income on rent.
| Measure | Lanark | Carroll County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $96,600 ±$2,369 | $114,500 | no clear change |
| Median gross rent | $819 ±$105 | $818 | no clear change |
| Renters paying 35% or more of income on rent | 26.2% ±16.2 pts | 28.9% | no clear change |
| Median monthly owner costs, with a mortgage | $958 ±$44 | $1,205 | – |
| Owner-occupied homes | 78.6% ±6.3 pts | 77.2% | no clear change |
| Renter-occupied homes | 21.4% ±6.3 pts | 22.8% | – |
| Housing units | 814 ±120 | 8,204 | no clear change |
| Homeowner vacancy rate | 4.0% ±5.2 pts | 1.3% | – |
| Rental vacancy rate | 6.3% ±8.6 pts | 5.2% | – |
| Single-family detached homes | 88.6% ±4.3 pts | 86.3% | – |
| Mobile homes | 0.9% ±0.9 pts | 3.3% | – |
| Built 2020 or later | 0.0% ±4.5 pts | 0.5% | – |
| Built 2010 to 2019 | 0.0% ±4.5 pts | 2.2% | – |
| Built 1939 or earlier | 46.1% ±9.1 pts | 35.0% | – |
| Households with no vehicle | 4.3% ±3.2 pts | 3.3% | – |
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 many new homes is Lanark building?
Builders took permits for 0 new housing units in Lanark in 2025 (0 in single-family houses), 0.0 per 1,000 residents against 1.5 across Illinois.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Lanark work and get to work?
86.1% of Lanark's workers drive alone and 3.6% work from home. The average trip to work takes 24.9 minutes.
| Measure | Lanark | Carroll County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 70.5% ±6.9 pts | 50.5% | – |
| Unemployment rate | 2.3% ±1.7 pts | 3.1% | – |
| Drove alone to work | 86.1% ±5.1 pts | 79.2% | – |
| Carpooled | 5.9% ±2.7 pts | 9.5% | – |
| Public transportation | 0.9% ±1.3 pts | 0.9% | – |
| Walked | 3.0% ±2.3 pts | 2.7% | – |
| Worked from home | 3.6% ±2.1 pts | 6.8% | – |
| Mean travel time to work | 24.9 min ±3.8 | 24.6 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 Lanark?
No census tract lies mostly in Lanark; 2 tracts reach into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 9601Carroll County | 3,666 | $74,861 |
| Tract 9605Carroll County | 2,489 | $69,784 |
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 Lanark) · Census block assignment files
How does Lanark compare with other places in Illinois?
By the Census Bureau's July 2025 estimates, Lanark is the 8,851st-most populous of the 19,476 U.S. incorporated places that have one and the 546th-most populous of 1,294 in Illinois.
Lanark ranks 1,105th of 1,380 places in Illinois with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 546th | 1,294 |
| Growth 2020-2025 (PEP) | 1,188th | 1,347 |
| Residents per square mile | 496th | 1,383 |
| Median household income | 1,105th | 1,380 |
| Per capita income | 919th | 1,383 |
| Median home value | 1,209th | 1,379 |
| Median gross rent | 921st | 1,280 |
| Poverty rate | 389th | 1,119 |
| Bachelor's degree or higher | 1,189th | 1,369 |
| Median age | 999th | 1,383 |
| Owner-occupied share | 649th | 1,382 |
| Work from home | 998th | 1,015 |
| Travel time to work | 753rd | 1,382 |
Lanark's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Lanark 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 Lanark?
19 of the 57 figures for Lanark 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 Lanark 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 Lanark.