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County · code 29007

Audrain CountyMissouri

Audrain County is a county in Missouri with its seat in Mexico. It was created on January 12, 1831.

  • Founded1831
  • County seatMexico
  • Named forJames Hunter Audrain
  • Land area692 sq mi + 4.6 sq mi water
  • Population24,962 2020 Census
  • Parcels mapped15,439 checked 14 October 2026
Open the free map Click any parcel in Audrain County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

MonroeCallawayRallsMontgomeryBoonePikeRandolph Mexico Census outline · seat marked

Where it is

Audrain 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 · Audrain highlighted

History

Formed in 1831 from Ralls County, Callaway County and Monroe County

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

Audrain County was created from Ralls County and other non-county areas, though parts were initially attached to Callaway, Monroe, and Ralls for civil and military purposes. It was fully organized and detached from those counties on December 17, 1836. The county was named after James Hunter Audrain.

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

  1. 1831
    Audrain County created Audrain created from Ralls, Non-County Area 3, and Non-County Area 17; Audrain not fully organized, parts attached to Callaway, Monroe, and Ralls "for all civil and military purposes."
    from Rallsfrom Callawayfrom Monroe
    · Mo. Laws 1830-1831, pub., ch. 13, secs. 1-2/p. 20
  2. 1836
    Changed Audrain fully organized, detached from Callaway, Monroe, and Ralls; Audrain's boundaries defined (no change).
    CallawayMonroeRalls
    · Mo. Laws 1836-1837, pub., pp. 44-45
  3. 1843
    Gained territory Audrain gained from Monroe.
    from Monroe
    · Mo. Laws 1842-1843, pub., p. 41

Land and parcels

What the maps cover in Audrain

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

Audrain by the Census

Population
24,962 2020 Census count
Housing units
10,542 2020 Census count
Land area
692 square miles
Water area
4.6 square miles
People per sq mi
36 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

Audrain 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

Open Audrain 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 Audrain County

When was Audrain County founded?
Audrain County was founded in 1831, formed from Ralls County, Callaway County and Monroe County, and named after James Hunter Audrain.
What is the county seat of Audrain County?
The county seat of Audrain County is Mexico.
Is there an online parcel map for Audrain County?
Yes. Audrain County publishes a parcel map of 15,439 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Audrain County's boundary or name changed?
Audrain County was created in 1831 from Ralls County, Callaway County and Monroe County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Monroe County.
Is my lot in a flood zone?
We do not have flood maps for Audrain 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