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St. Louis County, MO

98 cities and towns and 44 ZIP codes in St. Louis County, Missouri.

Population

995,569

Land area

508sq mi

People per sq mi

1,960

ZIP codes

44

Cities and towns in St. Louis County

Full map

St. Louis County at a glance

  • St. Louis County is about 22 times as dense as Missouri as a whole.
  • It is the most populous county in Missouri.
  • Households here earn a median of $82,936 a year, 17% more than the Missouri figure of $70,702.
  • A typical owner-occupied home is valued at $276,800 (20% above Missouri) and median rent is $1,209 a month.
  • The biggest population centers are Florissant (51,773), Chesterfield (49,574) and Oakville (35,333).

Local data for St. Louis County, MO

Counts from official public data

Housing and community stats

St. Louis County, MO, American Community Survey 2020-2024

Full profile

Median household income

$82,936

Poverty rate

9.8%

Median home value

$276,800

Prices +3.8% in a year

Median rent

$1,209/mo

Homeownership

69.2%

Bachelor's or higher

47.4%

Median age

40.3

Average commute

23.1 min

Largest reported origins and ancestries: German Americans (221,556), Irish Americans (121,090), Italian Americans (45,945).

Home values and rentsIncome, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

4.2%

Aug 2026, -0.3 pts in a year

Average annual pay

$78,741

589,803 jobs, 2025

Income per person

$104,775

BEA, 2024

Federal spending

$15.55B

FY 2026, $15,488 per person

PPP loans

$3.46B

40,556 loans, 360,691 jobs reported

Campaign donations

$19.88M

Itemized, 2026 cycle

EconomyFederal spendingPPP loans

How people get to work

St. Louis County, MO, workers 16 and older. American Community Survey 5-year estimates

  • Drove alone71.3%
  • Carpooled6.4%
  • Public transit1.4%
  • Walked1.4%
  • Bicycle0.2%
  • Taxi, ride-hailing, motorcycle or other1.0%
  • Worked from home18.3%

Average one-way commute: 23.1 minutes for people who do not work from home.

Environment and hazard risk

St. Louis County, MO, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively High

Top: heat wave

Storm events since 1996

1,321

Most often hail

Flood insurance policies

2,070

0.6% of homes, county

July high / Jan low

89° / 22°F

42.3 inches of rain a year

Hazards, floods and storm historyCheck a flood zone128 historic places

Health statistics

Share of adults in St. Louis County, MO, CDC PLACES estimates

All 40 measures

Obesity

31.3%

U.S. 33.3% -2.0 pts

Diabetes

11.5%

U.S. 12.1% -0.6 pts

Smoking

13.2%

U.S. 12.8% about the same

Uninsured (18-64)

7.0%

U.S. 11.1% -4.1 pts

Cities, towns and ZIP codes in St. Louis County

Population shown

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Frequently asked questions

What is the largest city in St. Louis County, MO?
Florissant is the largest city or town in St. Louis County, with about 51,773 residents.
How many ZIP codes are in St. Louis County?
St. Louis County includes 44 ZIP Code Tabulation Areas, including 63005, 63011, 63017, 63021, 63025.
What is the population of St. Louis County, MO?
About 995,569 people live in St. Louis County, based on American Community Survey 5-year estimates.
What counties border St. Louis County?
St. Louis County borders St. Charles County, St. Louis city, Madison County, IL, St. Clair County, IL, Jefferson County, Franklin County, Monroe County, IL.

Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023