Population (2020)3,538
Mercer County
MissouriPrinceton is the county seat of Mercer County, Missouri. Local heritage resources include Mercer County Genealogical and Historical Society.
Mercer County at a Glance
Population (2020)3,538
County SeatPrinceton
StateMissouri
Guide TypeCounty
Housing Units (2020)1,911
Land Area453.8 sq mi
Water Area1.3 sq mi
Forecast LocationBethany
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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.
Discover Mercer County
Mercer County
Princeton is the county seat of Mercer County, Missouri. Local heritage resources include Mercer County Genealogical and Historical Society.
Use this guide to explore businesses serving Mercer County, read local news and find public resources. The weather panel shows the forecast for Bethany, Missouri.
Get to Know the Area
Local identity
Princeton is the county seat of Mercer County, Missouri. Local heritage resources include Mercer County Genealogical and Historical Society.
Plan your visit
Start with the Missouri heritage directory for Mercer County and confirm visitor details with each destination.
Support local businesses
Open a portrait ad or sponsor banner to visit a featured business page and find its contact information.
Mercer County. Local places. Useful connections.
My Local Guide
Mercer County
Missouri Places and Stories
Mercer County news via Google News
Gene Kauffman scholarships support 36 Mercer County women - KTTN
Gene Kauffman scholarships support 36 Mercer County women KTTN
Read the Story Oct 16, 2026 • 2 min read
Around Mercer County
Stories from every corner of Mercer County.
Gene Kauffman scholarships support 36 Mercer County women - KTTN
Gene Kauffman scholarships support 36 Mercer County women KTTN
Oct 16, 2026 • 2 min read
Mercer County sheriff releases September enforcement activity report - KTTN
Mercer County sheriff releases September enforcement activity report KTTN
Oct 5, 2026 • 2 min read
State auditor cites Mercer County sheriff controls, policy issues - KTTN
State auditor cites Mercer County sheriff controls, policy issues KTTN
Oct 1, 2026 • 2 min read
Mercer County Ag Night in Princeton will cover Alpha-gal syndrome - KTTN
Mercer County Ag Night in Princeton will cover Alpha-gal syndrome KTTN
Sep 3, 2026 • 2 min read
Monticello Driver Injured In Mercer County Accident - Northwest MO Info
Monticello Driver Injured In Mercer County Accident Northwest MO Info
Aug 30, 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 Mercer County.
Local Information
Questions About Mercer County
County facts, visitor resources and practical links.
Princeton is the county seat of Mercer County, Missouri. Local heritage resources include Mercer County Genealogical and Historical Society.
The county seat is Princeton.
The population of 3,538 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 Mercer.
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 Bethany, Missouri, a nearby forecast shared with this guide. 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 Mercer 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
Mercer County Genealogical and Historical Society
Parks and Trails
Discover Missouri locally.Keep exploring.