Sullivan County, Missouri

Sullivan County, Missouri, has 5,738 residents (July 2025 estimate). Its county seat is Milan. It uses Central Time and covers 648 sq mi (1,678 km²) of land.

Sullivan County in Missouri

Sullivan County and its neighbors (simplified outlines). Open in OpenStreetMap ↗

Resident population, July 2025: 5,738
Land area: 648 sq mi (1,678 km²)
County seat or government: Milan
Time zone: Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income: $56,964 ± $4,179
Median home value: $115,600 ± $20,332
Median rent, with utilities: $673 ± $51
Homes lived in by their owners: 75.1% ± 2.7 points
County type: County
Metro or micro area: Outside any metro or micro areaNext to: Kirksville, MO micro area
Water area: 3.52 sq mi (9.12 km²)
State: Missouri
County code (FIPS): 29211
Coordinates (central point): 40.209588, -93.109784

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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 Sullivan 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

635653,965 people
635563,196 people
635441,159 people
63545968 people
64641625 people
64630495 people
64646471 people
64652346 people
63557272 people
64667255 people
64645195 people
6356672 people

All 13

6356061 people

13 ZIP Code areas overlap Sullivan 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 Sullivan County, largest first

Polk Township2,724 people
Penn Township1,243 people
Clay Township293 people
Bowman Township288 people
Taylor Township270 people
Jackson Township254 people
Buchanan Township187 people
Duncan Township176 people
Liberty Township162 people
Morris Township125 people
Union Township105 people
Pleasant Hill Township30 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Missouri, by county

School districts in Sullivan County, largest first

Putnam County R-I School District4,615 people
Milan C-2 School District3,223 people
Green City R-I School District1,663 people
Grundy County R-V School District1,241 people
Linn County R-I School District1,175 people
Newtown-Harris R-III School District394 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.

Bordering areas, nearest first

Distances are straight lines between map points.

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.

ZIP 64655