Township · Illinois
Rock Creek-Lima Township, Illinois
Rock Creek-Lima Township, township, in Carroll County, Illinois. Rock Creek-Lima Township had 1,928 residents on July 1, 2025 by the Census Bureau's estimate, down 3.3% since 2020; the 2020 Census counted 1,993 and the ACS 2020-2024 5-year estimates put it at 1,891 (±272). GEOID 1701564892.
Residents, July 2025 estimate
1,928
Census Bureau estimate (no margin published)
2020 Census count: 1,993 · ACS 2020-2024: 1,891 ±272
Median household income
$68,056
±$14,629 (90% margin)
Illinois: $83,390
Median home value
$102,800
±$9,552 (90% margin)
Illinois: $263,300
Median gross rent
$819
±$105 (90% margin)
Illinois: $1,274
Where is Rock Creek-Lima Township and what county is it in?
Rock Creek-Lima Township is a township in Carroll County, Illinois. It covers 54.0 square miles of land, 37 residents per square mile in 2020.
One place lies inside Rock Creek-Lima Township: Lanark (city, 1,504 in 2020).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Rock Creek-Lima Township, and is it growing?
The Census Bureau estimates that 1,928 people lived in Rock Creek-Lima Township on July 1, 2025, down 3.3% since 2020, a steeper fall than Illinois's (−0.8%). The 2020 Census counted 1,993 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 1,891 (±272).
| Measure | Rock Creek-Lima Township | Carroll County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 1,891±272 | 15,576 | no clear change |
| Households | 842±125 | 6,578 | no clear change |
| Average household size | 2.23±0.19 | 2.12 | no clear change |
| Housing units | 985±134 | 8,204 | no clear change |
Rock Creek-Lima Township's population since 2000
From 2,171 in 2000 to 1,928 in 2025: down 11.2%. The 2000, 2010 and 2020 figures are census counts, each for Rock Creek-Lima Township 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 Rock Creek-Lima Township?
The median resident of Rock Creek-Lima Township is 38.8 years old; 25.5% are under 18 and 22.1% are 65 or older. The largest group is non-Hispanic white residents at 94.0%, then Hispanic or Latino residents (of any race) at 3.5%.
| Measure | Rock Creek-Lima Township | Carroll County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 38.8±4.6 | 45.4 | no clear change |
| Under 18 years | 25.5%±4.3 pts | 17.7% | – |
| 65 years and over | 22.1%±5.8 pts | 24.2% | – |
| Male | 51.5%±4.4 pts | 54.9% | – |
| Hispanic or Latino (any race) | 3.5%±2.1 pts | 5.3% | – |
| White alone, not Hispanic | 94.0%±2.6 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%±2.0 pts | 0.8% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±2.0 pts | 0.3% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±2.0 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.5%±2.1 pts | 1.7% | – |
| Some other race alone, not Hispanic | 0.0%±2.0 pts | 0.2% | – |
| Born outside the United States | 0.2%±0.3 pts | 2.4% | – |
| Speak a language other than English at home (age 5+) | 0.9%±0.6 pts | 6.0% | – |
| Civilian veterans (age 18+) | 6.3%±2.8 pts | 8.6% | – |
| With a disability | 15.3%±4.0 pts | 16.2% | – |
| No health insurance coverage | 3.8%±2.6 pts | 5.8% | – |
| High school graduate or higher (age 25+) | 96.7%±2.0 pts | 88.9% | – |
| Bachelor's degree or higher (age 25+) | 15.6%±4.3 pts | 17.8% | −7.8 pts |
| Graduate or professional degree (age 25+) | 3.8%±1.8 pts | 4.6% | – |
| Lived in the same house a year earlier | 88.2%±6.1 pts | 90.2% | – |
| Moved from another state in the past year | 1.8%±1.7 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 Rock Creek-Lima Township earn?
Half of Rock Creek-Lima Township's 842 households earn less than $68,056 a year (±$14,629), against $60,758 in Carroll County and $83,390 in Illinois. In 2015-2019 it was $68,593 in 2024 dollars; the margins of error cannot tell the two periods apart. 10.3% of residents live below the poverty line.
| Measure | Rock Creek-Lima Township | Carroll County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $68,056±$14,629 | $60,758 | no clear change |
| Mean household income | $81,939±$7,158 | $77,693 | – |
| Per capita income | $35,093±$3,144 | $32,110 | no clear change |
| People below the poverty line | 10.3%±3.8 pts | 14.2% | no clear change |
| Children under 18 below the poverty line | 16.1%±8.4 pts | 23.1% | no clear change |
| Households receiving SNAP | 19.6%±6.2 pts | 15.1% | – |
| Households with a computer | 90.5%±5.5 pts | 92.0% | – |
| Households with a broadband subscription | 82.5%±5.9 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 Rock Creek-Lima Township?
Owners occupy 82.2% of Rock Creek-Lima Township's occupied homes and renters 17.8%. The median owner-occupied home is valued at $102,800 by its owner (±$9,552). The median renter pays $819 a month including utilities, and 26.2% of renters pay 35% or more of their income on rent.
| Measure | Rock Creek-Lima Township | Carroll County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $102,800±$9,552 | $114,500 | −$43,037 |
| 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 | $999±$220 | $1,205 | – |
| Owner-occupied homes | 82.2%±5.5 pts | 77.2% | no clear change |
| Renter-occupied homes | 17.8%±5.5 pts | 22.8% | – |
| Housing units | 985±134 | 8,204 | no clear change |
| Homeowner vacancy rate | 3.2%±4.2 pts | 1.3% | – |
| Rental vacancy rate | 6.3%±8.6 pts | 5.2% | – |
| Single-family detached homes | 90.6%±3.8 pts | 86.3% | – |
| Mobile homes | 0.7%±0.8 pts | 3.3% | – |
| Built 2020 or later | 0.0%±3.7 pts | 0.5% | – |
| Built 2010 to 2019 | 0.0%±3.7 pts | 2.2% | – |
| Built 1939 or earlier | 51.0%±8.4 pts | 35.0% | – |
| Households with no vehicle | 3.6%±2.7 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 do people in Rock Creek-Lima Township work and get to work?
86.5% of Rock Creek-Lima Township's workers drive alone and 3.1% work from home. The average trip to work takes 25.0 minutes.
| Measure | Rock Creek-Lima Township | Carroll County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 67.0%±6.7 pts | 50.5% | – |
| Unemployment rate | 2.0%±1.5 pts | 3.1% | – |
| Drove alone to work | 86.5%±5.5 pts | 79.2% | – |
| Carpooled | 5.1%±2.3 pts | 9.5% | – |
| Public transportation | 0.8%±1.1 pts | 0.9% | – |
| Walked | 2.6%±1.9 pts | 2.7% | – |
| Worked from home | 3.1%±1.7 pts | 6.8% | – |
| Mean travel time to work | 25.0 min±3.3 | 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 Rock Creek-Lima Township?
No census tract lies mostly in Rock Creek-Lima Township; 3 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 |
| Tract 9604Carroll County | 1,947 | $54,483 |
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 Rock Creek-Lima Township) · Census block assignment files
How does Rock Creek-Lima Township compare with other places in Illinois?
By the Census Bureau's July 2025 estimates, Rock Creek-Lima Township is the 4,978th-most populous of the 16,079 U.S. towns and townships that have one and the 447th-most populous of 1,407 in Illinois.
Rock Creek-Lima Township ranks 899th 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 | 447th | 1,407 |
| Growth 2020-2025 (PEP) | 1,076th | 1,347 |
| Residents per square mile | 1,261st | 1,383 |
| Median household income | 899th | 1,380 |
| Per capita income | 880th | 1,383 |
| Median home value | 1,157th | 1,379 |
| Median gross rent | 921st | 1,280 |
| Poverty rate | 543rd | 1,119 |
| Bachelor's degree or higher | 1,131st | 1,369 |
| Median age | 968th | 1,383 |
| Owner-occupied share | 484th | 1,382 |
| Work from home | 1,008th | 1,015 |
| Travel time to work | 742nd | 1,382 |
Rock Creek-Lima Township's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Rock Creek-Lima Township 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 Rock Creek-Lima Township?
19 of the 57 figures for Rock Creek-Lima Township 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 Rock Creek-Lima Township 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' school search.