Township · Michigan
Rock River Township, Michigan
Rock River Township, township, in Alger County, Michigan. Rock River Township had 1,230 residents on July 1, 2025 by the Census Bureau's estimate, down 1.1% since 2020; the 2020 Census counted 1,231 and the ACS 2020-2024 5-year estimates put it at 1,173 (±176). GEOID 2600369160.
Residents, July 2025 estimate
1,230
Census Bureau estimate (no margin published)
2020 Census count: 1,231 · ACS 2020-2024: 1,173 ±176
Median household income
$63,235
±$8,483 (90% margin)
Michigan: $72,875
Median home value
$213,800
±$23,027 (90% margin)
Michigan: $231,600
Median gross rent
$713
±$40 (90% margin)
Michigan: $1,129
Where is Rock River Township and what county is it in?
Rock River Township is a township in Alger County, Michigan. It covers 80.7 square miles of land, 15 residents per square mile in 2020.
One place lies inside Rock River Township: Chatham (village, 193 in 2020).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Rock River Township, and is it growing?
The Census Bureau estimates that 1,230 people lived in Rock River Township on July 1, 2025, down 1.1% since 2020, while Michigan grew 0.5%. The 2020 Census counted 1,231 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 1,173 (±176).
| Measure | Rock River Township | Alger County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 1,173±176 | 8,762 | no clear change |
| Households | 472±80 | 3,531 | no clear change |
| Average household size | 2.47±0.22 | 2.19 | no clear change |
| Housing units | 593±90 | 6,217 | −162 |
Rock River Township's population since 2000
From 1,213 in 2000 to 1,230 in 2025: up 1.4%. The 2000, 2010 and 2020 figures are census counts, each for Rock River 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 River Township?
The median resident of Rock River Township is 48.6 years old; 25.1% are under 18 and 28.3% are 65 or older. The largest group is non-Hispanic white residents at 96.2%, then non-Hispanic residents of two or more races at 2.4%.
| Measure | Rock River Township | Alger County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 48.6±3.8 | 49.1 | no clear change |
| Under 18 years | 25.1%±4.4 pts | 14.7% | – |
| 65 years and over | 28.3%±7.1 pts | 27.2% | – |
| Male | 48.5%±3.2 pts | 56.7% | – |
| Hispanic or Latino (any race) | 0.9%±0.8 pts | 1.8% | – |
| White alone, not Hispanic | 96.2%±2.0 pts | 81.4% | no clear change |
| Black or African American alone, not Hispanic | 0.1%±0.2 pts | 7.6% | – |
| Asian alone, not Hispanic | 0.0%±2.5 pts | 0.3% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.4%±0.5 pts | 2.3% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±2.5 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.4%±1.6 pts | 5.9% | – |
| Some other race alone, not Hispanic | 0.0%±2.5 pts | 0.7% | – |
| Born outside the United States | 1.0%±1.1 pts | 1.1% | – |
| Speak a language other than English at home (age 5+) | 5.3%±3.3 pts | 2.8% | – |
| Civilian veterans (age 18+) | 13.1%±4.2 pts | 8.4% | – |
| With a disability | 24.0%±7.4 pts | 20.5% | – |
| No health insurance coverage | 1.3%±0.9 pts | 4.3% | – |
| High school graduate or higher (age 25+) | 96.6%±2.6 pts | 93.9% | – |
| Bachelor's degree or higher (age 25+) | 23.4%±6.7 pts | 21.0% | +8.5 pts |
| Graduate or professional degree (age 25+) | 3.6%±2.1 pts | 6.1% | – |
| Lived in the same house a year earlier | 97.9%±1.6 pts | 93.4% | – |
| Moved from another state in the past year | 0.9%±1.2 pts | 0.3% | – |
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 River Township earn?
Half of Rock River Township's 472 households earn less than $63,235 a year (±$8,483), against $61,286 in Alger County and $72,875 in Michigan. In 2015-2019 it was $71,511 in 2024 dollars; the margins of error cannot tell the two periods apart. 10.8% of residents live below the poverty line.
| Measure | Rock River Township | Alger County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $63,235±$8,483 | $61,286 | no clear change |
| Mean household income | $81,854±$12,684 | $73,201 | – |
| Per capita income | $32,991±$6,340 | $29,895 | no clear change |
| People below the poverty line | 10.8%±5.0 pts | 10.4% | no clear change |
| Children under 18 below the poverty line | 7.0%±5.5 pts | 5.3% | – |
| Households receiving SNAP | 8.3%±5.6 pts | 11.0% | – |
| Households with a computer | 93.4%±4.3 pts | 92.0% | – |
| Households with a broadband subscription | 87.5%±5.6 pts | 85.4% | – |
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 River Township?
Owners occupy 97.9% of Rock River Township's occupied homes and renters 2.1%. The median owner-occupied home is valued at $213,800 by its owner (±$23,027). The median renter pays $713 a month including utilities, and 87.5% of renters pay 35% or more of their income on rent.
| Measure | Rock River Township | Alger County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $213,800±$23,027 | $176,200 | +$43,103 |
| Median gross rent | $713±$40 | $714 | −$246 |
| Renters paying 35% or more of income on rent | 87.5%±27.2 pts | 16.4% | no clear change |
| Median monthly owner costs, with a mortgage | $1,144±$132 | $1,249 | – |
| Owner-occupied homes | 97.9%±1.6 pts | 86.3% | +8.3 pts |
| Renter-occupied homes | 2.1%±1.6 pts | 13.7% | – |
| Housing units | 593±90 | 6,217 | −162 |
| Homeowner vacancy rate | 2.3%±3.0 pts | 1.1% | – |
| Rental vacancy rate | 0.0%±90.1 pts | 6.0% | – |
| Single-family detached homes | 89.2%±5.3 pts | 85.9% | – |
| Mobile homes | 9.1%±5.3 pts | 6.7% | – |
| Built 2020 or later | 0.5%±0.6 pts | 0.4% | – |
| Built 2010 to 2019 | 0.0%±4.9 pts | 4.5% | – |
| Built 1939 or earlier | 23.6%±7.3 pts | 15.9% | – |
| Households with no vehicle | 3.4%±2.9 pts | 5.6% | – |
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 River Township work and get to work?
81.3% of Rock River Township's workers drive alone. The average trip to work takes 26.2 minutes.
| Measure | Rock River Township | Alger County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 45.0%±10.0 pts | 41.3% | – |
| Unemployment rate | 5.4%±5.3 pts | 6.8% | – |
| Drove alone to work | 81.3%±6.2 pts | 71.7% | – |
| Carpooled | 12.5%±6.2 pts | 13.2% | – |
| Public transportation | 0.0%±7.4 pts | 0.8% | – |
| Walked | 1.3%±1.2 pts | 4.1% | – |
| Worked from home | 3.8%±3.0 pts | 8.2% | – |
| Mean travel time to work | 26.2 min±3.9 | 22.9 min | −13.1 min |
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 River Township?
No census tract lies mostly in Rock River Township; 2 tracts reach 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 River Township) · Census block assignment files
How does Rock River Township compare with other places in Michigan?
By the Census Bureau's July 2025 estimates, Rock River Township is the 6,795th-most populous of the 16,079 U.S. towns and townships that have one and the 842nd-most populous of 1,240 in Michigan.
Rock River Township ranks 905th of 1,354 places in Michigan with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 842nd | 1,240 |
| Growth 2020-2025 (PEP) | 959th | 1,281 |
| Residents per square mile | 1,327th | 1,356 |
| Median household income | 905th | 1,354 |
| Per capita income | 889th | 1,355 |
| Median home value | 618th | 1,354 |
| Median gross rent | 1,090th | 1,212 |
| Poverty rate | 576th | 1,213 |
| Bachelor's degree or higher | 635th | 1,350 |
| Median age | 300th | 1,356 |
| Owner-occupied share | 32nd | 1,356 |
| Travel time to work | 585th | 1,356 |
Rock River Township's figures with every place in Michigan (CSV)
Every place in Michigan, sortable · Compare Rock River 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 River Township?
22 of the 57 figures for Rock River 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 River 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.