Census tract · Jefferson County
Census Tract 7001.21, Jefferson County, Missouri
Census Tract 7001.21, GEOID 29099700121, in Jefferson County, Missouri, mostly within Arnold (97% of its census blocks). 4,019 residents in the ACS 2020-2024 5-year estimates (±617); the 2020 Census counted 3,887.
Residents, 2020-2024
4,019
±617 (90% margin)
2020 Census count: 3,887
Median household income
$84,250
±$11,428 (90% margin)
Jefferson County: $82,851
Median home value
$213,600
±$14,040 (90% margin)
Jefferson County: $237,200
Median gross rent
$1,216
±$231 (90% margin)
Jefferson County: $979
Where is Census Tract 7001.21?
Census Tract 7001.21 is one of 49 census tracts in Jefferson County, Missouri. It covers 1.77 square miles of land, 2,200 residents per square mile in 2020. Its GEOID, 29099700121, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Arnold | 97% |
5 census tracts border Census Tract 7001.21: Tract 7001.11 ($73,604), Tract 7001.14 ($77,382), Tract 7001.18 ($71,587), Tract 7001.22 ($82,938) and Tract 2213.32 in St. Louis County ($123,565). 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 7001.21?
The 2020-2024 American Community Survey puts Census Tract 7001.21's population at 4,019 (±617) in 1,565 households; the 2020 Census counted 3,887 residents and 1,590 housing units.
| Measure | Tract 7001.21 | Arnold |
|---|---|---|
| Total population | 4,019 ±617 | 20,956 |
| Households | 1,565 ±277 | 8,394 |
| Average household size | 2.57 ±0.24 | 2.49 |
| Housing units | 1,657 ±248 | 8,982 |
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 7001.21?
The median resident of Census Tract 7001.21 is 40.8 years old; 20.9% are under 18 and 21.7% are 65 or older. The largest group is non-Hispanic white residents at 83.4%, then non-Hispanic residents of two or more races at 13.4%. 7.0% of residents were born outside the United States.
| Measure | Tract 7001.21 | Arnold |
|---|---|---|
| Median age | 40.8 ±3.7 | 39.7 |
| Under 18 years | 20.9% ±4.6 pts | 20.7% |
| 65 years and over | 21.7% ±4.3 pts | 19.5% |
| Hispanic or Latino (any race) | 3.0% ±2.9 pts | 2.6% |
| White alone, not Hispanic | 83.4% ±11.7 pts | 88.0% |
| Black or African American alone, not Hispanic | 0.0% ±0.9 pts | 0.2% |
| Asian alone, not Hispanic | 0.3% ±0.5 pts | 1.8% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.9 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.9 pts | 0.1% |
| Two or more races, not Hispanic | 13.4% ±12.0 pts | 6.7% |
| Some other race alone, not Hispanic | 0.0% ±0.9 pts | 0.4% |
| Born outside the United States | 7.0% ±4.0 pts | 5.3% |
| Speak a language other than English at home (age 5+) | 8.6% ±5.5 pts | 7.8% |
| Civilian veterans (age 18+) | 4.4% ±2.1 pts | 6.3% |
| With a disability | 15.5% ±4.7 pts | 14.2% |
| No health insurance coverage | 10.8% ±9.5 pts | 7.5% |
| High school graduate or higher (age 25+) | 93.0% ±3.6 pts | 90.7% |
| Bachelor's degree or higher (age 25+) | 22.3% ±6.7 pts | 25.4% |
| Graduate or professional degree (age 25+) | 7.7% ±3.3 pts | 8.1% |
| Lived in the same house a year earlier | 95.9% ±2.6 pts | 92.2% |
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 7001.21 earn?
Half of the 1,565 households in Census Tract 7001.21 earn less than $84,250 a year (±$11,428), against $82,851 across Jefferson County: 25th highest of the county's 48 tracts with a reliable estimate.
| Measure | Tract 7001.21 | Arnold |
|---|---|---|
| Median household income | $84,250 ±$11,428 | $78,370 |
| Mean household income | $89,231 ±$11,245 | $91,307 |
| Per capita income | $35,915 ±$4,388 | $37,598 |
| People below the poverty line | 12.4% ±10.3 pts | 8.2% |
| Children under 18 below the poverty line | 26.0% ±22.9 pts | 12.7% |
| Households receiving SNAP | 3.3% ±2.8 pts | 3.6% |
| Households with a computer | 92.5% ±5.1 pts | 96.2% |
| Households with a broadband subscription | 92.3% ±5.5 pts | 91.4% |
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 Census Tract 7001.21?
Owners occupy 90.2% of Census Tract 7001.21's occupied homes and renters 9.8%. The median owner-occupied home is valued at $213,600 by its owner (±$14,040). The median renter pays $1,216 a month including utilities.
| Measure | Tract 7001.21 | Arnold |
|---|---|---|
| Median home value (owner-occupied) | $213,600 ±$14,040 | $220,000 |
| Median gross rent | $1,216 ±$231 | $1,112 |
| Renters paying 35% or more of income on rent | 30.5% ±31.1 pts | 28.6% |
| Median monthly owner costs, with a mortgage | $1,333 ±$201 | $1,495 |
| Owner-occupied homes | 90.2% ±4.8 pts | 79.8% |
| Renter-occupied homes | 9.8% ±4.8 pts | 20.2% |
| Housing units | 1,657 ±248 | 8,982 |
| Single-family detached homes | 78.0% ±8.0 pts | 79.0% |
| Mobile homes | 2.3% ±3.0 pts | 3.5% |
| Built 2020 or later | 0.0% ±2.1 pts | 0.9% |
| Built 2010 to 2019 | 4.0% ±3.8 pts | 5.3% |
| Built 1939 or earlier | 0.0% ±2.1 pts | 1.8% |
| Households with no vehicle | 2.3% ±2.2 pts | 2.7% |
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 7001.21 get to work?
80.9% of Census Tract 7001.21's workers drive alone and 11.7% work from home. The average trip to work takes 27.6 minutes.
| Measure | Tract 7001.21 | Arnold |
|---|---|---|
| In the labor force (age 16+) | 70.3% ±5.7 pts | 65.1% |
| Unemployment rate | 4.1% ±2.9 pts | 2.8% |
| Drove alone to work | 80.9% ±6.1 pts | 84.8% |
| Carpooled | 7.0% ±4.9 pts | 6.2% |
| Public transportation | 0.0% ±1.6 pts | 0.0% |
| Walked | 0.0% ±1.6 pts | 0.6% |
| Worked from home | 11.7% ±5.7 pts | 8.1% |
| Mean travel time to work | 27.6 min ±3.1 | 27.2 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 7001.21 compare with the other tracts in Jefferson County?
Among Jefferson County's tracts with a reliable estimate, Census Tract 7001.21 ranks as shown below (1 = highest).
| Measure | In Jefferson County | In Arnold |
|---|---|---|
| Population | 33rd of 49 | 6th of 8 |
| Residents per square mile | 7th of 49 | 3rd of 8 |
| Median household income | 25th of 48 | 3rd of 8 |
| Per capita income | 36th of 49 | 7th of 8 |
| Median home value | 33rd of 49 | 6th of 8 |
| Median gross rent | 11th of 45 | 3rd of 8 |
| Bachelor's degree or higher | 29th of 48 | 6th of 8 |
| Median age | 30th of 49 | 5th of 8 |
| Owner-occupied share | 14th of 49 | 3rd of 8 |
The tracts next to it on Jefferson County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 7004.01 | 22nd | $84,786±$16,982 · within the margin of this tract |
| Tract 7002.12 | 23rd | $84,740±$17,258 · within the margin of this tract |
| Tract 7003.05 | 24th | $84,375±$9,506 · within the margin of this tract |
| Tract 7001.21 | 25th | $84,250±$11,428 |
| Tract 7002.07 | 26th | $83,718±$10,051 · within the margin of this tract |
| Tract 7010.02 | 27th | $83,357±$18,524 · within the margin of this tract |
| Tract 7001.22 | 28th | $82,938±$17,142 · 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 7001.21?
4 of the 18 figures for Census Tract 7001.21 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