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County · code 29127

Marion CountyMissouri

Marion County is a county in Missouri, with its seat in Palmyra, formed in 1822.

  • Founded1822
  • County seatPalmyra
  • Named forFrancis Marion
  • Land area437 sq mi + 7.4 sq mi water
  • Population28,525 2020 Census
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Updated

RallsLewisShelbyAdams, ILMonroePike, IL Palmyra Census outline · seat marked

Where it is

Marion 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 · Marion highlighted

History

Formed in 1822 from Ralls County

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

Marion County was created from Ralls County on December 14, 1822, but remained attached to Ralls for military, civil, and judicial purposes until it was fully organized in 1826. The county was named after Francis Marion and later lost territory to the creation of Monroe, Lewis, Shelby, and Macon counties between 1831 and 1837, though it gained some land back from Monroe in 1843.

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

  1. 1822
    Marion County created Marion created from Ralls; Marion not fully organized, attached to Ralls "for all military, civil, and judicial purposes."
    from Ralls
    · Mo. Laws 1822, ch. 38, secs. 1-3/pp. 61-62
  2. 1826
    Lost territory Marion lost to Ralls; Marion fully organized, detached from Ralls; Non-County Area 10 detached from Ralls, attached to Marion "for all military, civil, and judicial purposes."
    to Ralls
    · Mo. Laws 1826-1827, ch. 31, secs. 1-2, 8/pp. 40-41
  3. 1831
    Lost territory Marion lost part of attached Non-County Area 10 to creation of Monroe.
    to Monroe
    · Mo. Laws 1830-1831, pub., ch. 15, secs. 1, 6/pp. 21-22
  4. 1833
    Lost territory Marion lost part of attached Non-County Area 10 to creation of Lewis and Non-County Area 19.
    to Lewis
    · Mo. Laws 1832-1833, pub., ch. 28, secs. 1, 6/pp. 51-52
  5. 1835
    Lost territory Marion lost part of attached Non-County Area 10 to creation of Shelby.
    to Shelby
    · Mo. Laws 1834-1835, priv. and loc., p. 40
  6. 1837
    Lost territory Marion lost attached Non-County Area 10 to creation of Macon; Non-County Area 10 eliminated.
    to Macon
    · Mo. Laws 1836–1837, pub., p. 51
  7. 1843
    Gained territory Marion gained from Monroe.
    from Monroe
    · Mo. Laws 1842-1843, pub., p. 42

Land and parcels

What the maps cover in Marion

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

Marion by the Census

Population
28,525 2020 Census count
Housing units
12,847 2020 Census count
Land area
437 square miles
Water area
7.4 square miles
People per sq mi
65 population ÷ land area

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

Rules and offices

Marion County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

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Questions

Common questions about Marion County

When was Marion County founded?
Marion County was founded in 1822, formed from Ralls County, and named after Francis Marion.
What is the county seat of Marion County?
The county seat of Marion County is Palmyra.
Is there an online parcel map for Marion 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 Marion County's boundary or name changed?
Marion County was created in 1822 from Ralls County. Since then the Atlas of Historical County Boundaries records 6 later changes, chiefly involving Monroe County, Lewis County and Macon County.
Is my lot in a flood zone?
We do not have flood maps for Marion 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