ZIP Codes of Saint Clair County, MO

Population & People
Population & People
Total Population
8,497
Household Income
Household Income
Median Income
$50,718
Housing
Housing
Total Housing Units
4,655
Business & Economy
Business & Economy
Total Businesses
141
Employment
Employment
Employment Rate
48.75%
Education
Education
Bachelor's Degree+
15.19%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 5 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:5 ZIP Codes (4 Standard, 1 PO Box, 0 Unique) [See All]
Area Codes:417 / 660
Timezone:Central (GMT -06:00)
Local Time:11:54:04 PM
Population:8,497 [See All]
FIPS:29185
Land Area:540 sq mi
Water Area:19 sq mi
Coordinates:38.0447, -93.7934
Quick Link:
https://www.zip-codes.com/county/mo-saint-clair.asp
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Missouri's #89 most populous county
8,497 residents across 5 ZIPs — #89 of 116 Missouri counties.

Standout ZIPs in this County


Most Populous
Osceola · 3,374 people
39.7% of county total
Highest Income
Collins · $61,493 median
1.2× county average
Largest Land Area
Osceola · 249.9 sq mi
Spans the most ground
Fastest Growth
Lowry City · 27.3% (10-yr)
1,317 → 1,676 residents
Most Educated
Appleton City · 20.2% bachelor's+
268 of 1,327 adults 25+

Things worth knowing about Saint Clair County


8,497 residents live across 5 ZIPs covering 540 sq mi, served by 5 distinct USPS-recognized cities.

Population moved from 8,211 to 8,497 from 2014 to 2024 — a +3.5% change. 2 ZIPs gained residents, 3 lost.

The county's wealthiest ZIP 64738 (Collins, $61,493 median) and poorest ZIP 64781 (Roscoe , $43,056) are 8.8 miles apart — a 1.4× income gap across local geography.

Median home values vary 1.8× across this county — from $115,600 in 64724 (Appleton City) to $211,700 in 64738 (Collins).

Density varies across the county — from 14 people/sq mi in 64776 (Osceola) to 22 in 64763 (Lowry City).

Educational attainment ranges from 7.3% bachelor's+ in 64763 (Lowry City) to 20.2% in 64724 (Appleton City) — the breadth of educational profiles across the area.

Within Missouri, this is the #89 most populous of 116 counties and ranks #101 for median household income .

Weighted by population, the typical household earns about $50,547 across the county — reflecting what a typical resident sees, not a simple ZIP average.

15.2% of adults age 25+ hold a bachelor's degree or higher (916 of 6,032 reporting).

4 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Saint Clair County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
540
square miles
Avg density
15.7
people per sq mi
Population
8,497
across 5 ZIPs
Osceola
249.9 sq mi
3,374 residents
Appleton City
131.4 sq mi
1,999 residents
Collins
84.5 sq mi
1,368 residents

All ZIP Codes in Saint Clair County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
64776OsceolaStandard3,374$44,880249.9-10.6%
64724Appleton CityStandard1,999$49,338131.4-4.0%
64763Lowry CityStandard1,676$54,82174.727.3%
64738CollinsStandard1,368$61,49384.548.1%
64781RoscoePO Box80$43,0560.0-29.8%

Adjacent & Nearby Counties