Where does this demographic data come from?

All demographic data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates, which samples about 3.5 million households annually. The 5-year estimates provide the most reliable data for small geographies like municipalities.

What is the difference between Census data and ACS data?

The decennial Census (conducted every 10 years) is a full population count focusing on basic demographics. The ACS is an ongoing survey that collects detailed data on income, education, housing, commute patterns, and more. ACS data is updated annually but represents averages over a 5-year period.

How accurate is this data for small towns?

For smaller municipalities, ACS estimates have wider margins of error because fewer residents are sampled. The 5-year estimates reduce this uncertainty by averaging over a longer period. For towns under 5,000 people, treat specific numbers as approximations rather than precise counts.

St. Mary, MO Population, Income & Demographics 2026

Showing latest census year. Full demographic history available with a paid plan. View plans →

Demographics — 2024 ACS 5-Year Estimatesi

Census

Populationi

285

Median Agei

48.9

Race & Ethnicityi

White

87.7%250

Two or More

8.8%25

Black

3.2%9

Hispanic/Latino

0.4%1

Educational Attainment (Age 25+)i

GED/Alternative

8.7%18

High School Diploma

33.7%70

Some College (<1 yr)

9.1%19

Some College (1+ yr)

10.6%22

Associate's Degree

4.3%9

Bachelor's Degree

5.8%12

Master's Degree

3.8%8

Professional Degree

0.5%1

Doctorate

0.5%1

HS or Higher

76.9%

BA or Higher

10.6%

Graduate+

4.8%

Housingi

Median Home Valuei

$120,000

Median Renti

$775

Tenure

Owner-Occupied

66.7%72

Renter-Occupied

33.3%36

Total Units

141

Homeownership

66.7%

Vacancy Rate

23.4%

Home Values

Under $50K

31.9%23

$50K–$100K

12.5%9

$100K–$150K

9.7%7

$150K–$200K

9.7%7

$200K–$300K

25%18

$300K–$500K

9.7%7

$500K–$1M

1.4%1

Rent Distribution

Under $500

$500–$750

$750–$1,000

$1,000–$1,250

$1,250–$1,500

Year Built

2010–2019

2.1%3

2000–2009

3.5%5

1990–1999

14.9%21

1980–1989

7.1%10

1970–1979

14.9%21

1960–1969

5%7

1950–1959

22%31

1940–1949

2.8%4

1939 or earlier

27.7%39

Heating Fuel

Bottled/LP Gas

49.1%53

Electricity

35.2%38

Wood

7.4%8

Utility Gas

6.5%7

Fuel Oil

1.9%2

Economyi

Median Household Incomei

$49,643

Mean Household Incomei

$59,120

Per Capita Incomei

$25,123

Poverty Ratei

24.9%

Unemploymenti

7.3%

Labor Forcei

110

Household Income Distribution

Under $10K

4.6%5

$10K–$15K

6.5%7

$15K–$20K

5.6%6

$20K–$25K

12%13

$25K–$30K

5.6%6

$30K–$35K

2.8%3

$35K–$40K

2.8%3

$40K–$45K

3.7%4

$45K–$50K

7.4%8

$50K–$60K

2.8%3

$60K–$75K

5.6%6

$75K–$100K

32.4%35

$100K–$125K

3.7%4

$125K–$150K

0.9%1

$150K–$200K

3.7%4

Ancestry & Heritage

Self-reported ancestry groups. Residents may report multiple ancestries, so totals may exceed 100%.

Social Characteristicsi

Marital Status (15+)i

Veteransi

30(13.1% of civilian adults)

Health Insurancei

90.2%Insured

9.8%Uninsured