Census tract · St. Charles County
Census Tract 3115, St. Charles County, Missouri
Census Tract 3115, GEOID 29183311500, in St. Charles County, Missouri, partly within St. Charles, St. Peters, O'Fallon and St. Paul. 2,087 residents in the ACS 2020-2024 5-year estimates (±285); the 2020 Census counted 2,205.
Residents, 2020-2024
2,087
±285 (90% margin)
2020 Census count: 2,205
Median household income
$49,182
±$4,758 (90% margin)
St. Charles County: $104,692
Median home value
$22,800
±$13,694 (90% margin)
St. Charles County: $320,800
Median gross rent
$1,116
±$177 (90% margin)
St. Charles County: $1,370
Where is Census Tract 3115?
Census Tract 3115 is one of 85 census tracts in St. Charles County, Missouri. It covers 56.55 square miles of land, 39 residents per square mile in 2020. Its GEOID, 29183311500, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| St. Charles | 34% |
| St. Peters | 25% |
| O'Fallon | 4% |
| St. Paul | 1% |
15 census tracts border Census Tract 3115: Tract 8104.02 in Lincoln County ($89,494), Tract 3101 ($94,130), Tract 3102.01 ($116,725), Tract 3102.02 ($76,950), Tract 3103.01 ($91,969), Tract 3106.02 ($108,625), Tract 3108.01 ($90,841), Tract 3108.02 ($95,554), Tract 3114.22 ($88,979), Tract 3116.02 ($86,426), Tract 3116.03 ($82,840), Tract 3116.04 ($98,403), Tract 3118.01 ($108,386), Tract 3120.01 ($160,368) and Tract 3124 ($49,737). 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 3115?
The 2020-2024 American Community Survey puts Census Tract 3115's population at 2,087 (±285) in 885 households; the 2020 Census counted 2,205 residents and 1,002 housing units.
| Measure | Tract 3115 | St. Charles County |
|---|---|---|
| Total population | 2,087 ±285 | 414,535 |
| Households | 885 ±106 | 161,311 |
| Average household size | 2.36 ±0.21 | 2.53 |
| Housing units | 922 ±106 | 167,163 |
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 3115?
The median resident of Census Tract 3115 is 38.0 years old; 24.8% are under 18 and 12.4% are 65 or older. The largest group is non-Hispanic white residents at 72.4%, then Hispanic or Latino residents (of any race) at 21.3%.
| Measure | Tract 3115 | St. Charles County |
|---|---|---|
| Median age | 38.0 ±1.2 | 39.8 |
| Under 18 years | 24.8% ±5.0 pts | 22.5% |
| 65 years and over | 12.4% ±4.0 pts | 17.0% |
| Hispanic or Latino (any race) | 21.3% ±9.3 pts | 4.2% |
| White alone, not Hispanic | 72.4% ±9.6 pts | 83.0% |
| Black or African American alone, not Hispanic | 1.8% ±1.8 pts | 5.0% |
| Asian alone, not Hispanic | 0.0% ±1.7 pts | 3.0% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±1.7 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.6% ±0.9 pts | 0.0% |
| Two or more races, not Hispanic | 3.9% ±2.3 pts | 4.3% |
| Some other race alone, not Hispanic | 0.0% ±1.7 pts | 0.4% |
| Born outside the United States | 8.0% ±7.9 pts | 4.5% |
| Speak a language other than English at home (age 5+) | 14.7% ±9.2 pts | 5.8% |
| Civilian veterans (age 18+) | 3.9% ±2.6 pts | 6.6% |
| With a disability | 21.3% ±6.7 pts | 11.7% |
| No health insurance coverage | 18.0% ±7.5 pts | 4.2% |
| High school graduate or higher (age 25+) | 80.3% ±8.2 pts | 95.7% |
| Bachelor's degree or higher (age 25+) | 9.9% ±4.5 pts | 42.7% |
| Graduate or professional degree (age 25+) | 1.4% ±1.8 pts | 15.8% |
| Lived in the same house a year earlier | 88.1% ±7.7 pts | 89.6% |
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 3115 earn?
Half of the 885 households in Census Tract 3115 earn less than $49,182 a year (±$4,758), against $104,692 across St. Charles County: 83rd highest of the county's 84 tracts with a reliable estimate. 11.7% of residents live below the poverty line.
| Measure | Tract 3115 | St. Charles County |
|---|---|---|
| Median household income | $49,182 ±$4,758 | $104,692 |
| Mean household income | $63,280 ±$6,762 | $129,305 |
| Per capita income | $26,974 ±$3,311 | $51,051 |
| People below the poverty line | 11.7% ±6.4 pts | 5.2% |
| Children under 18 below the poverty line | 17.3% ±17.3 pts | 5.7% |
| Households receiving SNAP | 10.8% ±5.9 pts | 3.6% |
| Households with a computer | 96.3% ±3.5 pts | 97.4% |
| Households with a broadband subscription | 90.6% ±5.0 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 3115?
Owners occupy 76.8% of Census Tract 3115's occupied homes and renters 23.2%. The median owner-occupied home is valued at $22,800 by its owner (±$13,694). The median renter pays $1,116 a month including utilities.
| Measure | Tract 3115 | St. Charles County |
|---|---|---|
| Median home value (owner-occupied) | $22,800 ±$13,694 | $320,800 |
| Median gross rent | $1,116 ±$177 | $1,370 |
| Renters paying 35% or more of income on rent | 20.8% ±16.4 pts | 34.5% |
| Median monthly owner costs, with a mortgage | $1,348 ±$183 | $1,866 |
| Owner-occupied homes | 76.8% ±7.7 pts | 80.5% |
| Renter-occupied homes | 23.2% ±7.7 pts | 19.5% |
| Housing units | 922 ±106 | 167,163 |
| Single-family detached homes | 18.8% ±6.6 pts | 74.7% |
| Mobile homes | 73.8% ±7.6 pts | 2.5% |
| Built 2020 or later | 2.2% ±3.2 pts | 3.3% |
| Built 2010 to 2019 | 12.0% ±6.4 pts | 14.4% |
| Built 1939 or earlier | 3.3% ±2.6 pts | 2.2% |
| Households with no vehicle | 6.2% ±5.3 pts | 3.8% |
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 3115 get to work?
60.1% of Census Tract 3115's workers drive alone. The average trip to work takes 23.8 minutes.
| Measure | Tract 3115 | St. Charles County |
|---|---|---|
| In the labor force (age 16+) | 73.9% ±7.1 pts | 69.4% |
| Unemployment rate | 9.6% ±6.9 pts | 2.9% |
| Drove alone to work | 60.1% ±14.5 pts | 73.8% |
| Carpooled | 29.6% ±12.8 pts | 5.9% |
| Public transportation | 0.0% ±3.1 pts | 0.1% |
| Walked | 4.7% ±5.3 pts | 0.8% |
| Worked from home | 4.2% ±3.5 pts | 18.0% |
| Mean travel time to work | 23.8 min ±3.6 | 24.5 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 3115 compare with the other tracts in St. Charles County?
Among St. Charles County's tracts with a reliable estimate, Census Tract 3115 ranks as shown below (1 = highest).
| Measure | In St. Charles County |
|---|---|
| Population | 82nd of 84 |
| Residents per square mile | 83rd of 85 |
| Median household income | 83rd of 84 |
| Per capita income | 83rd of 84 |
| Median home value | 84th of 84 |
| Median gross rent | 61st of 73 |
| Poverty rate | 6th of 36 |
| Bachelor's degree or higher | 84th of 84 |
| Median age | 60th of 84 |
| Owner-occupied share | 56th of 84 |
The tracts next to it on St. Charles County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3107 | 80th | $58,574±$9,702 · within the margin of this tract |
| Tract 3121.95 | 81st | $52,461±$11,529 · within the margin of this tract |
| Tract 3124 | 82nd | $49,737±$6,549 · within the margin of this tract |
| Tract 3115 | 83rd | $49,182±$4,758 |
| Tract 3105.01 | 84th | $48,676±$9,324 · 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 3115?
3 of the 18 figures for Census Tract 3115 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