St. Peters, Missouri demographics

St. Peters, MO demographics: median age 41.0; 39.2% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · St. Peters city, Missouri · Incorporated city · GEOID 2965126. The survey estimates a population of 59,092 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in St. Peters is 41.0 years, with a 90% margin of error of 1.1 years. There are 24,591 households (±651). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	41.0 ±1.1	39.0 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 59,092
Category	Count ± MOE	Share ± MOE (pp)	Missouri	U.S.
Under 18	12,344 ±949	20.9% ±1.6 pp	22.3%	22.0%
18–34	11,819 ±806	20.0% ±1.4 pp	22.3%	22.8%
35–64	23,468 ±1,150	39.7% ±1.9 pp	37.5%	38.0%
65 and older	11,461 ±791	19.4% ±1.3 pp	17.9%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 59,092
Category	Count ± MOE	Share ± MOE (pp)	Missouri	U.S.
Male	27,857 ±557	47.1% ±0.9 pp	49.3%	49.5%
Female	31,235 ±564	52.9% ±1.0 pp	50.7%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 59,092
Category	Count ± MOE	Share ± MOE (pp)	Missouri	U.S.
White alone	50,784 ±827	85.9% ±1.4 pp	77.5%	61.0%
Black or African American alone	2,848 ±529	4.8% ±0.9 pp	11.0%	12.2%
American Indian and Alaska Native alone	28 ±37 · low precision	0.0% ±0.1 pp · low precision	0.3%	0.9%
Asian alone	1,513 ±380	2.6% ±0.6 pp	2.1%	6.0%
Native Hawaiian and Other Pacific Islander alone	45 ±52 · low precision	0.1% ±0.1 pp · low precision	0.1%	0.2%
Some other race alone	571 ±246	1.0% ±0.4 pp	1.9%	7.1%
Two or more races	3,303 ±593	5.6% ±1.0 pp	7.1%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 59,092
Category	Count ± MOE	Share ± MOE (pp)	Missouri	U.S.
Not Hispanic or Latino	57,379 ±365	97.1% ±0.6 pp	94.8%	80.7%
Hispanic or Latino	1,713 ±365	2.9% ±0.6 pp	5.2%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 24,591
Category	Count ± MOE	Share ± MOE (pp)	Missouri	U.S.
Married-couple family	12,462 ±415	50.7% ±1.0 pp	46.5%	46.9%
Other family: male householder, no spouse present	1,013 ±232	4.1% ±0.9 pp	4.6%	5.1%
Other family: female householder, no spouse present	1,833 ±314	7.5% ±1.3 pp	11.0%	12.2%
Nonfamily: householder living alone	7,569 ±724	30.8% ±2.8 pp	31.1%	28.7%
Nonfamily: householder not living alone	1,714 ±291	7.0% ±1.2 pp	6.7%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 24,591
Category	Count ± MOE	Share ± MOE (pp)	Missouri	U.S.
Households with people under 18	6,592 ±372	26.8% ±1.3 pp	28.5%	29.5%
Households without people under 18	17,999 ±832	73.2% ±2.8 pp	71.5%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 24,591
Category	Count ± MOE	Share ± MOE (pp)	Missouri	U.S.
One-person nonfamily households	7,569 ±724	30.8% ±2.8 pp	31.1%	28.7%
Two-person households	8,738 ±648	35.5% ±2.5 pp	35.0%	33.8%
Three-person households	2,926 ±407	11.9% ±1.6 pp	14.1%	15.3%
Four-person households	3,201 ±374	13.0% ±1.5 pp	11.6%	12.6%
Five-person households	1,608 ±326	6.5% ±1.3 pp	5.2%	5.9%
Six-person households	334 ±135	1.4% ±0.5 pp	1.9%	2.2%
Seven or more people	215 ±115 · low precision	0.9% ±0.5 pp · low precision	1.1%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 59,092
Category	Count ± MOE	Share ± MOE (pp)	Missouri	U.S.
Native	56,849 ±408	96.2% ±0.7 pp	95.5%	85.9%
Foreign born	2,243 ±412	3.8% ±0.7 pp	4.5%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 55,662
Category	Count ± MOE	Share ± MOE (pp)	Missouri	U.S.
English only	53,106 ±762	95.4% ±0.9 pp	93.3%	77.7%
Spanish	808 ±238	1.5% ±0.4 pp	2.9%	13.6%
French, Haitian, or Cajun	135 ±101 · low precision	0.2% ±0.2 pp · low precision	0.3%	0.7%
German or other West Germanic	237 ±143 · low precision	0.4% ±0.3 pp · low precision	0.5%	0.5%
Russian, Polish, or other Slavic	30 ±43 · low precision	0.1% ±0.1 pp · low precision	0.5%	0.7%
Other Indo-European	274 ±209 · low precision	0.5% ±0.4 pp · low precision	0.6%	2.0%
Korean	23 ±35 · low precision	0.0% ±0.1 pp · low precision	0.1%	0.3%
Chinese, including Mandarin and Cantonese	345 ±190 · low precision	0.6% ±0.3 pp · low precision	0.4%	1.1%
Vietnamese	88 ±77 · low precision	0.2% ±0.1 pp · low precision	0.2%	0.5%
Tagalog, including Filipino	260 ±133 · low precision	0.5% ±0.2 pp · low precision	0.2%	0.6%
Other Asian and Pacific Island	153 ±95 · low precision	0.3% ±0.2 pp · low precision	0.5%	1.1%
Arabic	55 ±69 · low precision	0.1% ±0.1 pp · low precision	0.2%	0.5%
Other and unspecified	148 ±189 · low precision	0.3% ±0.3 pp · low precision	0.4%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 42,349
Category	Count ± MOE	Share ± MOE (pp)	Missouri	U.S.
Less than high school graduate	1,751 ±352	4.1% ±0.8 pp	8.1%	10.4%
High school graduate or equivalency	9,489 ±798	22.4% ±1.8 pp	30.2%	26.0%
Some college, no degree	10,450 ±905	24.7% ±2.1 pp	20.8%	19.1%
Associate’s degree	4,066 ±500	9.6% ±1.2 pp	8.4%	8.8%
Bachelor’s degree	10,564 ±662	24.9% ±1.5 pp	19.8%	21.6%
Graduate or professional degree	6,029 ±568	14.2% ±1.3 pp	12.6%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 58,393
Category	Count ± MOE	Share ± MOE (pp)	Missouri	U.S.
Same house	52,857 ±803	90.5% ±1.3 pp	87.4%	87.7%
Moved within same county	2,920 ±593	5.0% ±1.0 pp	6.2%	6.3%
Moved from a different county in the same state	1,638 ±362	2.8% ±0.6 pp	3.6%	3.1%
Moved from a different state	774 ±364	1.3% ±0.6 pp	2.5%	2.3%
Moved from abroad	204 ±132 · low precision	0.3% ±0.2 pp · low precision	0.4%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

3.8% of St. Peters residents (±0.7 percentage points) had no health insurance coverage when surveyed, compared with 8.8% in Missouri and 8.4% nationally. 94.3% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	St. Peters	Missouri	U.S.	Compared with Missouri
People without health insurance Civilian noninstitutionalized population	3.8% ±0.7 pp	8.8%	8.4%	Lower
Households with a broadband subscription Households	94.3% ±1.5 pp	89.3%	91.0%	Higher
Veterans Civilian population age 18 and older	7.1% ±1.0 pp	7.3%	6.2%	Not statistically different

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for St. Peters . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read St. Peters housing and cost context or return to the city profile.