Census tract · Cascade County
Census Tract 21, Cascade County, Montana
Census Tract 21, GEOID 30013002100, in Cascade County, Montana, mostly within Great Falls (68% of its census blocks). 5,608 residents in the ACS 2020-2024 5-year estimates (±597); the 2020 Census counted 5,866.
Residents, 2020-2024
5,608
±597 (90% margin)
2020 Census count: 5,866
Median household income
$49,655
±$20,693 (90% margin)
Cascade County: $67,690
Median home value
$352,300
±$33,442 (90% margin)
Cascade County: $265,300
Median gross rent
$931
±$66 (90% margin)
Cascade County: $939
Where is Census Tract 21?
Census Tract 21 is one of 25 census tracts in Cascade County, Montana. It covers 16.86 square miles of land, 348 residents per square mile in 2020. Its GEOID, 30013002100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Great Falls | 68% |
| Gibson Flats | 4% |
7 census tracts border Census Tract 21: Tract 9 ($46,250), Tract 10 ($72,128), Tract 11 ($65,239), Tract 12.02 ($52,604), Tract 22.01 ($68,725), Tract 22.02 ($61,058) and Tract 106 ($78,250). The figure in brackets is each tract's median household income.
Whether a tract counts as low- or moderate-income for bank lending (the Community Reinvestment Act) is set by the FFIEC against its metro area's family income: look it up in the FFIEC census geocoder.
Source: 2024 Gazetteer and 2020 block assignment files, U.S. Census Bureau · Census reference files
How many people live in Census Tract 21?
The 2020-2024 American Community Survey puts Census Tract 21's population at 5,608 (±597) in 2,665 households; the 2020 Census counted 5,866 residents and 2,757 housing units.
| Measure | Tract 21 | Great Falls |
|---|---|---|
| Total population | 5,608 ±597 | 60,329 |
| Households | 2,665 ±226 | 26,379 |
| Average household size | 1.86 ±0.16 | 2.21 |
| Housing units | 2,800 ±199 | 28,418 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Census Tract 21?
The median resident of Census Tract 21 is 44.1 years old; 16.2% are under 18 and 25.1% are 65 or older. The largest group is non-Hispanic white residents at 80.9%, then non-Hispanic residents of two or more races at 6.3%.
| Measure | Tract 21 | Great Falls |
|---|---|---|
| Median age | 44.1 ±2.6 | 39.0 |
| Under 18 years | 16.2% ±3.3 pts | 21.4% |
| 65 years and over | 25.1% ±3.9 pts | 20.0% |
| Hispanic or Latino (any race) | 6.2% ±3.9 pts | 5.1% |
| White alone, not Hispanic | 80.9% ±6.0 pts | 82.3% |
| Black or African American alone, not Hispanic | 1.0% ±1.3 pts | 1.0% |
| Asian alone, not Hispanic | 2.4% ±2.0 pts | 1.0% |
| American Indian and Alaska Native alone, not Hispanic | 3.2% ±2.5 pts | 3.7% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.5 pts | 0.0% |
| Two or more races, not Hispanic | 6.3% ±3.8 pts | 6.0% |
| Some other race alone, not Hispanic | 0.0% ±0.5 pts | 0.8% |
| Born outside the United States | 1.3% ±1.1 pts | 2.2% |
| Speak a language other than English at home (age 5+) | 3.1% ±2.2 pts | 3.6% |
| Civilian veterans (age 18+) | 12.0% ±3.0 pts | 12.4% |
| With a disability | 21.0% ±6.1 pts | 18.1% |
| No health insurance coverage | 9.3% ±5.9 pts | 7.0% |
| High school graduate or higher (age 25+) | 97.5% ±1.9 pts | 94.7% |
| Bachelor's degree or higher (age 25+) | 33.4% ±7.4 pts | 27.8% |
| Graduate or professional degree (age 25+) | 11.1% ±4.2 pts | 10.4% |
| Lived in the same house a year earlier | 74.1% ±7.2 pts | 83.6% |
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 Census Tract 21 earn?
Half of the 2,665 households in Census Tract 21 earn less than $49,655 a year (±$20,693), against $67,690 across Cascade County: 21st highest of the county's 25 tracts with a reliable estimate. 18.5% of residents live below the poverty line.
| Measure | Tract 21 | Great Falls |
|---|---|---|
| Median household income | $49,655 ±$20,693 | $63,373 |
| Mean household income | $103,576 ±$29,000 | $85,486 |
| Per capita income | $52,433 ±$15,046 | $38,231 |
| People below the poverty line | 18.5% ±6.4 pts | 14.5% |
| Children under 18 below the poverty line | 27.7% ±19.0 pts | 19.3% |
| Households receiving SNAP | 9.5% ±4.1 pts | 12.7% |
| Households with a computer | 91.0% ±5.3 pts | 94.3% |
| Households with a broadband subscription | 85.1% ±5.7 pts | 90.1% |
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 Census Tract 21?
Owners occupy 43.1% of Census Tract 21's occupied homes and renters 56.9%. The median owner-occupied home is valued at $352,300 by its owner (±$33,442). The median renter pays $931 a month including utilities, and 37.6% of renters pay 35% or more of their income on rent.
| Measure | Tract 21 | Great Falls |
|---|---|---|
| Median home value (owner-occupied) | $352,300 ±$33,442 | $257,000 |
| Median gross rent | $931 ±$66 | $900 |
| Renters paying 35% or more of income on rent | 37.6% ±12.0 pts | 34.1% |
| Median monthly owner costs, with a mortgage | $1,895 ±$331 | $1,501 |
| Owner-occupied homes | 43.1% ±5.5 pts | 66.1% |
| Renter-occupied homes | 56.9% ±5.5 pts | 33.9% |
| Housing units | 2,800 ±199 | 28,418 |
| Single-family detached homes | 40.6% ±7.6 pts | 65.2% |
| Mobile homes | 0.7% ±1.1 pts | 4.2% |
| Built 2020 or later | 4.1% ±3.6 pts | 1.2% |
| Built 2010 to 2019 | 18.7% ±6.9 pts | 5.3% |
| Built 1939 or earlier | 2.7% ±2.6 pts | 16.8% |
| Households with no vehicle | 9.0% ±6.7 pts | 7.1% |
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 Census Tract 21 get to work?
89.4% of Census Tract 21's workers drive alone. The average trip to work takes 14.7 minutes.
| Measure | Tract 21 | Great Falls |
|---|---|---|
| In the labor force (age 16+) | 52.6% ±6.3 pts | 62.4% |
| Unemployment rate | 0.4% ±0.9 pts | 3.7% |
| Drove alone to work | 89.4% ±5.7 pts | 79.3% |
| Carpooled | 0.7% ±1.3 pts | 9.7% |
| Public transportation | 0.0% ±1.2 pts | 0.8% |
| Walked | 8.4% ±6.2 pts | 2.0% |
| Worked from home | 1.2% ±1.6 pts | 6.8% |
| Mean travel time to work | 14.7 min ±2.0 | 14.9 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
How does Census Tract 21 compare with the other tracts in Cascade County?
Among Cascade County's tracts with a reliable estimate, Census Tract 21 ranks as shown below (1 = highest).
| Measure | In Cascade County | In Great Falls |
|---|---|---|
| Population | 2nd of 25 | 2nd of 19 |
| Residents per square mile | 20th of 25 | 18th of 19 |
| Median household income | 21st of 25 | 15th of 19 |
| Per capita income | 2nd of 25 | 2nd of 19 |
| Median home value | 4th of 23 | 3rd of 19 |
| Median gross rent | 15th of 25 | 11th of 19 |
| Poverty rate | 4th of 22 | 4th of 17 |
| Bachelor's degree or higher | 8th of 25 | 6th of 19 |
| Median age | 5th of 25 | 3rd of 19 |
| Owner-occupied share | 20th of 23 | 16th of 19 |
The tracts next to it on Cascade County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 4 | 18th | $57,700±$11,388 · within the margin of this tract |
| Tract 12.02 | 19th | $52,604±$11,377 · within the margin of this tract |
| Tract 16 | 20th | $51,953±$17,285 · within the margin of this tract |
| Tract 21 | 21st | $49,655±$20,693 |
| Tract 8 | 22nd | $48,750±$14,232 · within the margin of this tract |
| Tract 9 | 23rd | $46,250±$9,468 · within the margin of this tract |
| Tract 7 | 24th | $44,766±$7,998 · within the margin of this tract |
"Within the margin": the two incomes differ by less than their combined 90% margins, so the survey cannot say which is higher and the ranks between them are not firm.
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · How ranks are computed
How reliable are the figures for Census Tract 21?
3 of the 18 figures for Census Tract 21 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.
A census tract's figures rest on a few hundred sampled households over five years, so its margins are wider than a city's. Two tracts differ only when the gap between them is larger than their combined 90% margin (the square root of the sum of the two squared margins). 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 · Check it at data.census.gov
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections