Mercer County, Missouri
Mercer County, Missouri, has 3,404 residents (July 2025 estimate). Its county seat is Princeton. It uses Central Time and covers 454 sq mi (1,175 km²) of land.
- Resident population, July 2025
- 3,404
- Land area
- 454 sq mi (1,175 km²)
- County seat or government
- Princeton
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $62,679 ± $14,517
- Median home value
- $104,900 ± $15,308
- Median rent, with utilities
- $590 ± $150
- Homes lived in by their owners
- 81% ± 7.4 points
- County type
- County
- Metro or micro area
- Outside any metro or micro area
- Water area
- 1.27 sq mi (3.3 km²)
- State
- Missouri
- County code (FIPS)
- 29129
- Coordinates (central point)
- 40.421413, -93.567631
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Mercer County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Central TimeAmerica/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 646732,497 people
- 64679921 people
- 64661757 people
- 64632371 people
- 64667255 people
- 64645195 people
- 64672185 people
7 ZIP Code areas overlap Mercer County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Townships in Mercer County, largest first
- Morgan Township1,550 people
- Marion Township781 people
- Washington Township368 people
- Madison Township231 people
- Ravanna Township152 people
- Harrison Township127 people
- Medicine Township102 people
- Lindley Township89 people
- Somerset Township82 people
People counts are American Community Survey 2020–2024 5-year estimates. All townships in Missouri, by county
School districts in Mercer County, largest first
- South Harrison County R-II School District4,776 people
- Princeton R-V School District2,495 people
- North Mercer County R-III School District939 people
- Spickard R-II School District627 people
- Newtown-Harris R-III School District394 people
- Cainsville R-I School District354 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Princeton, Missouri (city)1,352 people
- Mercer, Missouri (town)325 people
- Ravanna, Missouri (CDP)68 people
- South Lineville, Missouri (town)16 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Grundy County, Missouri21 mi south
- Harrison County, Missouri23 mi west
- Decatur County, Iowa25 mi northwest
- Wayne County, Iowa25 mi northeast
- Sullivan County, Missouri28 mi southeast
- Putnam County, Missouri29 mi east
Before using this answer on a form
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