Township · Illinois
Rock Run Township, Illinois
Rock Run Township, township, in Stephenson County, Illinois. Rock Run Township had 2,118 residents on July 1, 2025 by the Census Bureau's estimate, down 3.2% since 2020; the 2020 Census counted 2,212 and the ACS 2020-2024 5-year estimates put it at 2,162 (±373). GEOID 1717765143.
Residents, July 2025 estimate
2,118
Census Bureau estimate (no margin published)
2020 Census count: 2,212 · ACS 2020-2024: 2,162 ±373
Median household income
$90,083
±$19,690 (90% margin)
Illinois: $83,390
Median home value
$164,800
±$13,928 (90% margin)
Illinois: $263,300
Median gross rent
$838
±$334 (90% margin)
Illinois: $1,274
Where is Rock Run Township and what county is it in?
Rock Run Township is a township in Stephenson County, Illinois. It covers 47.8 square miles of land, 46 residents per square mile in 2020.
2 places lie inside Rock Run Township: Davis (village, 589 in 2020) and Rock City (village, 293 in 2020). Part of Lake Summerset (CDP) also lies in it.
Rock Run Township is in the Freeport, IL micropolitan statistical area (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Rock Run Township, and is it growing?
The Census Bureau estimates that 2,118 people lived in Rock Run Township on July 1, 2025, down 3.2% since 2020, a steeper fall than Illinois's (−0.8%). The 2020 Census counted 2,212 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 2,162 (±373).
| Measure | Rock Run Township | Stephenson County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 2,162±373 | 43,768 | no clear change |
| Households | 885±115 | 19,358 | no clear change |
| Average household size | 2.44±0.29 | 2.22 | no clear change |
| Housing units | 994±134 | 21,330 | no clear change |
Rock Run Township's population since 2000
From 2,252 in 2000 to 2,118 in 2025: down 6.0%. The 2000, 2010 and 2020 figures are census counts, each for Rock Run 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 Run Township?
The median resident of Rock Run Township is 50.6 years old; 17.6% are under 18 and 23.7% are 65 or older. The largest group is non-Hispanic white residents at 88.2%, then Hispanic or Latino residents (of any race) at 7.7%.
| Measure | Rock Run Township | Stephenson County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 50.6±6.0 | 45.3 | no clear change |
| Under 18 years | 17.6%±5.2 pts | 21.2% | – |
| 65 years and over | 23.7%±4.9 pts | 24.4% | – |
| Male | 46.4%±4.4 pts | 48.9% | – |
| Hispanic or Latino (any race) | 7.7%±6.4 pts | 5.6% | – |
| White alone, not Hispanic | 88.2%±6.7 pts | 78.9% | −10.2 pts |
| Black or African American alone, not Hispanic | 0.0%±1.7 pts | 8.5% | – |
| Asian alone, not Hispanic | 0.0%±1.7 pts | 0.8% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.7 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.7 pts | 0.0% | – |
| Two or more races, not Hispanic | 4.1%±2.9 pts | 5.6% | – |
| Some other race alone, not Hispanic | 0.0%±1.7 pts | 0.4% | – |
| Born outside the United States | 4.1%±4.7 pts | 2.6% | – |
| Speak a language other than English at home (age 5+) | 4.8%±4.8 pts | 3.8% | – |
| Civilian veterans (age 18+) | 5.4%±1.8 pts | 7.5% | – |
| With a disability | 12.4%±3.5 pts | 15.7% | – |
| No health insurance coverage | 3.1%±2.1 pts | 5.2% | – |
| High school graduate or higher (age 25+) | 95.2%±2.7 pts | 92.6% | – |
| Bachelor's degree or higher (age 25+) | 26.6%±10.0 pts | 20.7% | no clear change |
| Graduate or professional degree (age 25+) | 11.4%±4.9 pts | 7.0% | – |
| Lived in the same house a year earlier | 91.8%±4.3 pts | 87.6% | – |
| Moved from another state in the past year | 1.3%±1.0 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 Run Township earn?
Half of Rock Run Township's 885 households earn less than $90,083 a year (±$19,690), against $64,043 in Stephenson County and $83,390 in Illinois. In 2015-2019 it was $82,069 in 2024 dollars; the margins of error cannot tell the two periods apart. 2.9% of residents live below the poverty line.
| Measure | Rock Run Township | Stephenson County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $90,083±$19,690 | $64,043 | no clear change |
| Mean household income | $116,425±$20,326 | $79,920 | – |
| Per capita income | $48,210±$6,934 | $35,305 | no clear change |
| People below the poverty line | 2.9%±1.4 pts | 13.9% | no clear change |
| Children under 18 below the poverty line | 0.0%±9.4 pts | 19.9% | – |
| Households receiving SNAP | 6.6%±3.7 pts | 17.0% | – |
| Households with a computer | 94.6%±3.4 pts | 91.7% | – |
| Households with a broadband subscription | 86.2%±6.3 pts | 86.5% | – |
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 Run Township?
Owners occupy 86.6% of Rock Run Township's occupied homes and renters 13.4%. The median owner-occupied home is valued at $164,800 by its owner (±$13,928). The median renter pays $838 a month including utilities.
| Measure | Rock Run Township | Stephenson County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $164,800±$13,928 | $134,900 | no clear change |
| Median gross rent | $838±$334 | $798 | no clear change |
| Renters paying 35% or more of income on rent | 20.4%±16.2 pts | 30.2% | – |
| Median monthly owner costs, with a mortgage | $1,577±$206 | $1,312 | – |
| Owner-occupied homes | 86.6%±5.4 pts | 70.9% | no clear change |
| Renter-occupied homes | 13.4%±5.4 pts | 29.1% | – |
| Housing units | 994±134 | 21,330 | no clear change |
| Homeowner vacancy rate | 0.0%±4.8 pts | 0.5% | – |
| Rental vacancy rate | 2.5%±5.9 pts | 4.1% | – |
| Single-family detached homes | 92.8%±4.1 pts | 75.9% | – |
| Mobile homes | 3.1%±2.7 pts | 3.6% | – |
| Built 2020 or later | 0.0%±3.7 pts | 0.1% | – |
| Built 2010 to 2019 | 2.5%±1.8 pts | 2.2% | – |
| Built 1939 or earlier | 45.2%±10.3 pts | 33.6% | – |
| Households with no vehicle | 2.3%±1.5 pts | 7.9% | – |
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 Run Township work and get to work?
76.1% of Rock Run Township's workers drive alone and 17.3% work from home. The average trip to work takes 29.9 minutes.
| Measure | Rock Run Township | Stephenson County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 64.2%±4.7 pts | 60.6% | – |
| Unemployment rate | 3.4%±2.4 pts | 4.3% | – |
| Drove alone to work | 76.1%±7.1 pts | 77.9% | – |
| Carpooled | 3.2%±2.1 pts | 7.7% | – |
| Public transportation | 0.0%±3.3 pts | 0.6% | – |
| Walked | 2.5%±2.9 pts | 2.0% | – |
| Worked from home | 17.3%±7.8 pts | 10.3% | +10.8 pts |
| Mean travel time to work | 29.9 min±4.0 | 20.7 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 Run Township?
1 census tract lies mostly in Rock Run Township, and 1 more reaches into it (2020 census blocks).
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 Run Township) · Census block assignment files
How does Rock Run Township compare with other places in Illinois?
By the Census Bureau's July 2025 estimates, Rock Run Township is the 4,631st-most populous of the 16,079 U.S. towns and townships that have one and the 418th-most populous of 1,407 in Illinois.
Rock Run Township ranks 476th 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 | 418th | 1,407 |
| Growth 2020-2025 (PEP) | 1,058th | 1,347 |
| Residents per square mile | 1,190th | 1,383 |
| Median household income | 476th | 1,380 |
| Per capita income | 305th | 1,383 |
| Median home value | 712th | 1,379 |
| Median gross rent | 868th | 1,280 |
| Poverty rate | 1,085th | 1,119 |
| Bachelor's degree or higher | 582nd | 1,369 |
| Median age | 69th | 1,383 |
| Owner-occupied share | 305th | 1,382 |
| Work from home | 214th | 1,015 |
| Travel time to work | 289th | 1,382 |
Rock Run Township's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Rock Run 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 Run Township?
21 of the 57 figures for Rock Run 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 Run 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.