Population (2020)1,004,125
St. Louis County
MissouriClayton is the county seat of St. Louis County. The county is a separate jurisdiction from the independent City of St. Louis.
St. Louis County at a Glance
Population (2020)1,004,125
County SeatClayton
StateMissouri
Guide TypeCounty
Housing Units (2020)444,653
Land Area508.1 sq mi
Water Area15.4 sq mi
Forecast LocationSt. Louis County
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Discover St. Louis County
St. Louis County
Clayton is the county seat of St. Louis County. The county is a separate jurisdiction from the independent City of St. Louis.
Use this guide to explore businesses serving St. Louis County, read local news and find public resources. The weather panel shows the forecast for St. Louis County, Missouri.
Get to Know the Area
Local identity
Clayton is the county seat of St. Louis County. The county is a separate jurisdiction from the independent City of St. Louis.
Plan your visit
Explore Babler State Park, Castlewood State Park.
Support local businesses
Open a portrait ad or sponsor banner to visit a featured business page and find its contact information.
St. Louis County. Local places. Useful connections.
My Local Guide
St. Louis County
Missouri Places and Stories
St. Louis County news via Google News
Republican Chris Stigall wins open 6th District seat - KCUR
Republican Chris Stigall wins open 6th District seat KCUR
Read the Story Nov 4, 2026 • 2 min read
Around St. Louis County
Stories from every corner of St. Louis County.
Republican Chris Stigall wins open 6th District seat - KCUR
Republican Chris Stigall wins open 6th District seat KCUR
Nov 4, 2026 • 2 min read
Missouri Congressional District 2 Winner - Spectrum News
Missouri Congressional District 2 Winner Spectrum News
Nov 4, 2026 • 2 min read
St. Louis County Executive race results | 2026 Midterm Election - KSDK
St. Louis County Executive race results | 2026 Midterm Election KSDK
Nov 4, 2026 • 2 min read
Jake Zimmerman wins election for St. Louis County Executive - FOX 2
Jake Zimmerman wins election for St. Louis County Executive FOX 2
Nov 4, 2026 • 2 min read
Zimmerman wins St. Louis County Executive’s race - KMOV
Zimmerman wins St. Louis County Executive’s race KMOV
Nov 4, 2026 • 2 min read
Shop - Dine - Discover
Meet Local Businesses
Support the businesses that help make our communities thrive. From family-owned shops and restaurants to trusted local services, discover businesses worth visiting throughout the county.
Public Resources
Find the Right Service
Official directories and agency links for residents and visitors. Use the county or city filters on the linked sites to find the service you need.
Government
Missouri county government directory
Find county offices and official contacts through the Missouri Association of Counties.
Schools
Missouri school directory
Filter the state school directory by county to find districts and school buildings.
Hospitals
Missouri Department of Health and Senior Services
Use the state health department’s hospital and provider resources to locate facilities and confirm available services.
Public Safety
Missouri Department of Public Safety
Find state public safety agencies and law enforcement resources.
Emergency Services
Missouri State Emergency Management Agency
Find preparedness information, recovery resources and state emergency updates. Call 911 for an emergency.
State Parks
Missouri State Parks
Find parks, historic sites, maps and current visitor information.
Trails
Missouri parks and trails map
Explore the state parks and trails map, then check the managing agency for current access information.
Utilities
Missouri utility locator
Search by community for utility providers; confirm service availability for the property with the provider.
Libraries
Missouri State Library
Use Find a library to locate public library services in the area.
Courts
Missouri Courts
Find Missouri court locations and official court information.
DMV
Missouri license office locator
Locate a license office and check its services before visiting.
Transportation
Missouri Department of Transportation
Find road information, travel resources and transportation contacts.
Postal Services
USPS location finder
Search by city or ZIP Code to find post offices and postal services.
Veterans
Missouri Veterans Commission
Find veterans service officers and state veterans resources.
Employment
Missouri job and career services
Find job search assistance, career resources and Missouri Job Centers.
Plan Your Next Step
Helpful starting points for life and travel in St. Louis County.
Local Information
Questions About St. Louis County
County facts, visitor resources and practical links.
Clayton is the county seat of St. Louis County. The county is a separate jurisdiction from the independent City of St. Louis.
The county seat is Clayton.
The population of 1,004,125 is the April 1, 2020 Census count. It is a historical census figure, not a current estimate. View Census data
Browse Missouri’s county heritage directory and select St. Louis.
Start with Babler State Park, Castlewood State Park, Route 66 State Park. Use Missouri’s parks and trails map for additional options.
Use Missouri’s school directory and filter by county or district.
Open the Missouri county directory to locate official county contacts.
Use the USPS ZIP Code lookup with the full street address. A county may contain multiple ZIP Codes.
The forecast is for St. Louis County, Missouri. Conditions elsewhere in the area can differ.
Select a portrait advertisement or sponsor banner on this page. Both open the matching business page with further information.
County population, housing and area figures come from the 2020 Census; county seats come from Missouri DNR. News headlines link to their publishers through the configured RSS feed.
Shop - Dine - Discover
Meet Local Businesses
Support the businesses that help make our communities thrive. From family-owned shops and restaurants to trusted local services, discover businesses worth visiting throughout the county.
My Local Guide
Explore St. Louis County
Local Businesses and Places to StartVisit featured businesses and use official resources to plan your time in the area.
Featured Businesses
History and Culture
Missouri county heritage directory
Babler State Park, Castlewood State Park, Center of Contemporary Arts, Faust Historical Village
Parks and Trails
Discover Missouri locally.Keep exploring.