Census tract · Arapahoe County
Census Tract 866, Arapahoe County, Colorado
Census Tract 866, GEOID 08005086600, in Arapahoe County, Colorado, mostly within Aurora (87% of its census blocks). 6,640 residents in the ACS 2020-2024 5-year estimates (±684); the 2020 Census counted 6,842.
Residents, 2020-2024
6,640
±684 (90% margin)
2020 Census count: 6,842
Median household income
$112,237
±$6,622 (90% margin)
Arapahoe County: $101,087
Median home value
$662,600
±$26,962 (90% margin)
Arapahoe County: $561,200
Median gross rent
$2,239
±$153 (90% margin)
Arapahoe County: $1,891
Where is Census Tract 866?
Census Tract 866 is one of 161 census tracts in Arapahoe County, Colorado. It covers 2.87 square miles of land, 2,381 residents per square mile in 2020. Its GEOID, 08005086600, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Aurora | 87% |
6 census tracts border Census Tract 866: Tract 71.12 ($169,286), Tract 853 ($143,788), Tract 865 ($119,500), Tract 867 ($197,424), Tract 139.12 in Douglas County ($129,896) and Tract 139.13 in Douglas County ($199,028). 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 866?
The 2020-2024 American Community Survey puts Census Tract 866's population at 6,640 (±684) in 3,011 households; the 2020 Census counted 6,842 residents and 3,227 housing units.
| Measure | Tract 866 | Aurora |
|---|---|---|
| Total population | 6,640 ±684 | 394,432 |
| Households | 3,011 ±260 | 145,310 |
| Average household size | 2.21 ±0.14 | 2.70 |
| Housing units | 3,189 ±243 | 152,377 |
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 866?
The median resident of Census Tract 866 is 51.7 years old; 14.0% are under 18 and 36.0% are 65 or older. The largest group is non-Hispanic white residents at 72.2%, then non-Hispanic Black residents at 9.2%. 9.1% of residents were born outside the United States.
| Measure | Tract 866 | Aurora |
|---|---|---|
| Median age | 51.7 ±2.9 | 35.3 |
| Under 18 years | 14.0% ±2.9 pts | 23.9% |
| 65 years and over | 36.0% ±4.2 pts | 12.4% |
| Hispanic or Latino (any race) | 6.8% ±2.5 pts | 31.4% |
| White alone, not Hispanic | 72.2% ±7.3 pts | 40.9% |
| Black or African American alone, not Hispanic | 9.2% ±6.4 pts | 15.3% |
| Asian alone, not Hispanic | 5.2% ±3.6 pts | 6.0% |
| American Indian and Alaska Native alone, not Hispanic | 0.2% ±0.3 pts | 0.3% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.8% ±0.9 pts | 0.4% |
| Two or more races, not Hispanic | 4.4% ±3.2 pts | 5.2% |
| Some other race alone, not Hispanic | 1.2% ±1.2 pts | 0.6% |
| Born outside the United States | 9.1% ±4.1 pts | 22.4% |
| Speak a language other than English at home (age 5+) | 8.8% ±4.0 pts | 33.1% |
| Civilian veterans (age 18+) | 11.0% ±2.8 pts | 7.1% |
| With a disability | 14.1% ±3.8 pts | 11.6% |
| No health insurance coverage | 3.6% ±3.1 pts | 13.7% |
| High school graduate or higher (age 25+) | 98.1% ±1.5 pts | 86.3% |
| Bachelor's degree or higher (age 25+) | 51.7% ±5.5 pts | 33.6% |
| Graduate or professional degree (age 25+) | 22.3% ±5.0 pts | 11.9% |
| Lived in the same house a year earlier | 84.5% ±7.6 pts | 83.3% |
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 Census Tract 866 earn?
Half of the 3,011 households in Census Tract 866 earn less than $112,237 a year (±$6,622), against $101,087 across Arapahoe County: 65th highest of the county's 159 tracts with a reliable estimate. 3.1% of residents live below the poverty line.
| Measure | Tract 866 | Aurora |
|---|---|---|
| Median household income | $112,237 ±$6,622 | $88,368 |
| Mean household income | $134,966 ±$18,643 | $112,543 |
| Per capita income | $61,963 ±$7,052 | $42,105 |
| People below the poverty line | 3.1% ±1.4 pts | 11.9% |
| Children under 18 below the poverty line | 1.8% ±3.0 pts | 18.1% |
| Households receiving SNAP | 4.1% ±3.5 pts | 11.1% |
| Households with a computer | 100.0% ±1.4 pts | 97.6% |
| Households with a broadband subscription | 98.9% ±1.3 pts | 93.6% |
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 866?
Owners occupy 67.5% of Census Tract 866's occupied homes and renters 32.5%. The median owner-occupied home is valued at $662,600 by its owner (±$26,962). The median renter pays $2,239 a month including utilities, and 29.4% of renters pay 35% or more of their income on rent.
| Measure | Tract 866 | Aurora |
|---|---|---|
| Median home value (owner-occupied) | $662,600 ±$26,962 | $469,100 |
| Median gross rent | $2,239 ±$153 | $1,835 |
| Renters paying 35% or more of income on rent | 29.4% ±14.7 pts | 50.0% |
| Median monthly owner costs, with a mortgage | $2,412 ±$218 | $2,217 |
| Owner-occupied homes | 67.5% ±5.3 pts | 62.4% |
| Renter-occupied homes | 32.5% ±5.3 pts | 37.6% |
| Housing units | 3,189 ±243 | 152,377 |
| Single-family detached homes | 47.4% ±6.5 pts | 53.1% |
| Mobile homes | 0.0% ±1.3 pts | 1.5% |
| Built 2020 or later | 2.6% ±2.3 pts | 3.2% |
| Built 2010 to 2019 | 31.0% ±6.9 pts | 11.6% |
| Built 1939 or earlier | 0.0% ±1.3 pts | 1.0% |
| Households with no vehicle | 0.9% ±1.0 pts | 6.6% |
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 Census Tract 866 get to work?
55.4% of Census Tract 866's workers drive alone and 28.9% work from home. The average trip to work takes 34.0 minutes.
| Measure | Tract 866 | Aurora |
|---|---|---|
| In the labor force (age 16+) | 54.9% ±5.3 pts | 72.0% |
| Unemployment rate | 5.2% ±4.1 pts | 5.9% |
| Drove alone to work | 55.4% ±8.3 pts | 66.5% |
| Carpooled | 9.2% ±6.1 pts | 10.2% |
| Public transportation | 0.0% ±1.4 pts | 3.4% |
| Walked | 2.1% ±3.0 pts | 1.5% |
| Worked from home | 28.9% ±8.7 pts | 16.5% |
| Mean travel time to work | 34.0 min ±9.8 | 28.6 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 866 compare with the other tracts in Arapahoe County?
Among Arapahoe County's tracts with a reliable estimate, Census Tract 866 ranks as shown below (1 = highest).
| Measure | In Arapahoe County | In Aurora |
|---|---|---|
| Population | 14th of 160 | 14th of 89 |
| Residents per square mile | 138th of 161 | 78th of 90 |
| Median household income | 65th of 159 | 21st of 89 |
| Per capita income | 48th of 160 | 6th of 89 |
| Median home value | 43rd of 158 | 7th of 87 |
| Median gross rent | 49th of 146 | 26th of 85 |
| Poverty rate | 84th of 90 | 55th of 59 |
| Bachelor's degree or higher | 70th of 161 | 12th of 89 |
| Median age | 5th of 160 | 2nd of 89 |
| Owner-occupied share | 90th of 159 | 46th of 89 |
The tracts next to it on Arapahoe County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 71.11 | 62nd | $114,435±$36,102 · within the margin of this tract |
| Tract 66.03 | 63rd | $113,594±$22,540 · within the margin of this tract |
| Tract 56.25 | 64th | $113,188±$21,150 · within the margin of this tract |
| Tract 866 | 65th | $112,237±$6,622 |
| Tract 803 | 66th | $112,108±$28,489 · within the margin of this tract |
| Tract 834 | 67th | $111,974±$18,731 · within the margin of this tract |
| Tract 848 | 68th | $111,912±$16,499 · 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 866?
2 of the 18 figures for Census Tract 866 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