Census tract · Jefferson County
Census Tract 120.31, Jefferson County, Colorado
Census Tract 120.31, GEOID 08059012031, in Jefferson County, Colorado, partly within Brook Forest. 3,249 residents in the ACS 2020-2024 5-year estimates (±319); the 2020 Census counted 3,779.
Residents, 2020-2024
3,249
±319 (90% margin)
2020 Census count: 3,779
Median household income
$133,603
±$13,978 (90% margin)
Jefferson County: $110,656
Median home value
$834,200
±$39,131 (90% margin)
Jefferson County: $637,600
Median gross rent
not published
Jefferson County: $1,861
Where is Census Tract 120.31?
Census Tract 120.31 is one of 146 census tracts in Jefferson County, Colorado. It covers 18.52 square miles of land, 204 residents per square mile in 2020. Its GEOID, 08059012031, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Brook Forest | 17% |
6 census tracts border Census Tract 120.31: Tract 147.01 in Clear Creek County ($174,563), Tract 120.26 ($149,375), Tract 120.30 ($146,650), Tract 120.32 ($140,476), Tract 120.37 ($132,929) and Tract 1.02 in Park County ($122,361). 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 120.31?
The 2020-2024 American Community Survey puts Census Tract 120.31's population at 3,249 (±319) in 1,357 households; the 2020 Census counted 3,779 residents and 1,617 housing units.
| Measure | Tract 120.31 | Jefferson County |
|---|---|---|
| Total population | 3,249 ±319 | 579,377 |
| Households | 1,357 ±135 | 241,735 |
| Average household size | 2.39 ±0.14 | 2.36 |
| Housing units | 1,581 ±97 | 253,574 |
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 120.31?
The median resident of Census Tract 120.31 is 46.8 years old; 20.9% are under 18 and 20.3% are 65 or older. The largest group is non-Hispanic white residents at 81.0%, then Hispanic or Latino residents (of any race) at 6.1%. 7.7% of residents were born outside the United States.
| Measure | Tract 120.31 | Jefferson County |
|---|---|---|
| Median age | 46.8 ±3.5 | 40.5 |
| Under 18 years | 20.9% ±2.5 pts | 18.5% |
| 65 years and over | 20.3% ±4.0 pts | 17.9% |
| Hispanic or Latino (any race) | 6.1% ±3.6 pts | 16.1% |
| White alone, not Hispanic | 81.0% ±5.6 pts | 75.2% |
| Black or African American alone, not Hispanic | 0.0% ±1.3 pts | 1.1% |
| Asian alone, not Hispanic | 3.3% ±2.6 pts | 2.9% |
| American Indian and Alaska Native alone, not Hispanic | 0.2% ±0.4 pts | 0.2% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±1.3 pts | 0.1% |
| Two or more races, not Hispanic | 6.1% ±4.0 pts | 4.0% |
| Some other race alone, not Hispanic | 3.4% ±3.1 pts | 0.4% |
| Born outside the United States | 7.7% ±3.1 pts | 6.3% |
| Speak a language other than English at home (age 5+) | 11.3% ±3.7 pts | 10.0% |
| Civilian veterans (age 18+) | 7.1% ±3.6 pts | 6.5% |
| With a disability | 9.2% ±3.0 pts | 11.0% |
| No health insurance coverage | 6.4% ±3.5 pts | 5.3% |
| High school graduate or higher (age 25+) | 97.2% ±1.9 pts | 95.8% |
| Bachelor's degree or higher (age 25+) | 68.9% ±6.4 pts | 52.0% |
| Graduate or professional degree (age 25+) | 33.1% ±6.5 pts | 19.3% |
| Lived in the same house a year earlier | 96.2% ±2.6 pts | 85.8% |
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 120.31 earn?
Half of the 1,357 households in Census Tract 120.31 earn less than $133,603 a year (±$13,978), against $110,656 across Jefferson County: 43rd highest of the county's 142 tracts with a reliable estimate.
| Measure | Tract 120.31 | Jefferson County |
|---|---|---|
| Median household income | $133,603 ±$13,978 | $110,656 |
| Mean household income | $161,443 ±$15,966 | $142,995 |
| Per capita income | $67,883 ±$6,291 | $60,827 |
| People below the poverty line | 0.5% ±0.6 pts | 6.7% |
| Children under 18 below the poverty line | 0.0% ±6.1 pts | 7.0% |
| Households receiving SNAP | 0.4% ±0.6 pts | 5.5% |
| Households with a computer | 98.7% ±1.5 pts | 97.6% |
| Households with a broadband subscription | 95.9% ±2.9 pts | 95.1% |
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 120.31?
Owners occupy 93.1% of Census Tract 120.31's occupied homes and renters 6.9%. The median owner-occupied home is valued at $834,200 by its owner (±$39,131).
| Measure | Tract 120.31 | Jefferson County |
|---|---|---|
| Median home value (owner-occupied) | $834,200 ±$39,131 | $637,600 |
| Renters paying 35% or more of income on rent | 50.0% ±50.0 pts | 42.5% |
| Median monthly owner costs, with a mortgage | $3,161 ±$357 | $2,498 |
| Owner-occupied homes | 93.1% ±4.7 pts | 70.7% |
| Renter-occupied homes | 6.9% ±4.7 pts | 29.3% |
| Housing units | 1,581 ±97 | 253,574 |
| Single-family detached homes | 100.0% ±2.6 pts | 63.8% |
| Mobile homes | 0.0% ±2.6 pts | 0.8% |
| Built 2020 or later | 3.2% ±3.5 pts | 1.7% |
| Built 2010 to 2019 | 1.9% ±1.7 pts | 8.7% |
| Built 1939 or earlier | 5.4% ±4.6 pts | 2.8% |
| Households with no vehicle | 1.4% ±1.6 pts | 4.0% |
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 120.31 get to work?
57.3% of Census Tract 120.31's workers drive alone and 32.7% work from home. The average trip to work takes 40.2 minutes.
| Measure | Tract 120.31 | Jefferson County |
|---|---|---|
| In the labor force (age 16+) | 65.5% ±4.4 pts | 69.3% |
| Unemployment rate | 3.4% ±2.8 pts | 3.9% |
| Drove alone to work | 57.3% ±6.8 pts | 64.4% |
| Carpooled | 6.7% ±5.6 pts | 5.7% |
| Public transportation | 0.0% ±2.5 pts | 1.3% |
| Walked | 1.7% ±1.5 pts | 1.4% |
| Worked from home | 32.7% ±6.2 pts | 25.4% |
| Mean travel time to work | 40.2 min ±8.7 | 26.0 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 120.31 compare with the other tracts in Jefferson County?
Among Jefferson County's tracts with a reliable estimate, Census Tract 120.31 ranks as shown below (1 = highest).
| Measure | In Jefferson County |
|---|---|
| Population | 98th of 143 |
| Residents per square mile | 136th of 146 |
| Median household income | 43rd of 142 |
| Per capita income | 41st of 143 |
| Median home value | 20th of 140 |
| Bachelor's degree or higher | 16th of 142 |
| Median age | 24th of 143 |
| Owner-occupied share | 22nd of 140 |
The tracts next to it on Jefferson County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 117.12 | 40th | $134,857±$16,569 · within the margin of this tract |
| Tract 98.35 | 41st | $133,676±$14,830 · within the margin of this tract |
| Tract 117.26 | 42nd | $133,672±$39,348 · within the margin of this tract |
| Tract 120.31 | 43rd | $133,603±$13,978 |
| Tract 120.45 | 44th | $133,075±$9,684 · within the margin of this tract |
| Tract 120.37 | 45th | $132,929±$17,653 · within the margin of this tract |
| Tract 98.29 | 46th | $132,750±$42,132 · 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 120.31?
3 of the 17 figures for Census Tract 120.31 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