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County · code 29211

Sullivan CountyMissouri

Sullivan County is a county in Missouri with its seat in Milan, formed in 1843.

  • Founded1843
  • County seatMilan
  • Named forJohn Sullivan
  • Land area648 sq mi + 3.5 sq mi water
  • Population5,999 2020 Census
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Updated

PutnamLinnGrundy Milan Census outline · seat marked

Where it is

Sullivan on the map of Missouri

Missouri has 115 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Missouri · Sullivan highlighted

History

Formed in 1843 from Linn County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Originally created as Highland County and initially attached to Linn County for civil and military purposes, the county was renamed Sullivan in 1845 and fully organized. Sullivan County was named after John Sullivan.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1843
    Sullivan County created Highland (now Sullivan) created from part of Non-County Area 23; Highland (now Sullivan) not fully organized, attached to Linn "for all civil and military purposes."
    from Linn
    · Mo. Laws 1842-1843, pub., pp. 37-38
  2. 1845
    Renamed Highland renamed Sullivan; Sullivan fully organized, detached from Linn.
    formerly Highland
    · Mo. Laws 1844-1845, secs. 19, 43/pp. 33, 36
  3. 1845
    Changed Non-County Area 23 detached from Linn and attached to Sullivan "for civil and military purposes." Non-County Area 36 attached to Sullivan "for civil and military purposes."
    Linn
    · Mo. Laws 1844-1845, loc. and priv., p. 47
  4. 1846
    Lost territory Sullivan lost attached Non-County Area 23 and Non-County Area 36 to creation of Dodge (extinct); Non-County Area 23 and Non-County Area 36 eliminated.
    to Dodge
    · Mo. Laws 1846-1847, pub., p. 16

Land and parcels

What the maps cover in Sullivan

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Sullivan by the Census

Population
5,999 2020 Census count
Housing units
3,024 2020 Census count
Land area
648 square miles
Water area
3.5 square miles
People per sq mi
9 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

See your own lot on these maps

Open Sullivan County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Sullivan County

When was Sullivan County founded?
Sullivan County was founded in 1843, formed from Linn County, and named after John Sullivan.
What is the county seat of Sullivan County?
The county seat of Sullivan County is Milan.
Is there an online parcel map for Sullivan County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Sullivan County's boundary or name changed?
Sullivan County was created in 1843 from Linn County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Linn County, Dodge County and Highland County. It was formerly called Highland.
Is my lot in a flood zone?
We do not have flood maps for Sullivan County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door