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County · code 29005

Atchison CountyMissouri

Atchison County is a county in Missouri with its seat at Rock Port. The county was formed in 1843 from Holt County and named after David Rice Atchison.

  • Founded1843
  • County seatRock Port
  • Named forDavid Rice Atchison
  • Land area547 sq mi + 2.8 sq mi water
  • Population5,305 2020 Census
  • Parcels mapped6,178 checked 14 October 2026
Open the free map Click any parcel in Atchison County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Fremont, IAHoltNemaha, NENodawayOtoe, NE Rock Port Census outline · seat marked

Where it is

Atchison 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 · Atchison highlighted

History

Formed in 1843 from Holt County

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

Originally created as Allen County on February 24, 1843, it was renamed Atchison on February 14, 1845, and fully organized as a separate county. The county exchanged boundary areas with Holt and Nodaway counties over several decades, with the most significant adjustment being a U.S. Supreme Court decision in 1849 that settled a long-standing boundary dispute between Missouri and Iowa.

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

  1. 1843
    Atchison County created Allen (now Atchison) created from Holt; Allen not fully organized, attached to Holt "for all civil and military purposes."
    from Holt
    · History of Holt and Atchison Counties, 101, 285; Mo. Laws 1842-1843, pub., pp. 34-35
  2. 1845
    Renamed Allen renamed Atchison; Atchison fully organized, detached from Holt; Atchison exchanged with Holt. Overlap area created along Atchison's eastern border when Nodaway's boundaries are redefined.
    formerly Allen
    · Mo. Laws 1844-1845, secs. 29-31/pp. 34-35
  3. 1845
    Changed Area of overlap between Atchison and Nodaway assigned to Nodaway.
    Nodaway
    · Mo. Rev. Stat. 1845, secs. 71-72/pp. 143-144
  4. 1849
    Changed U.S. Supreme Court settled boundary dispute between Missouri and Iowa, dating from 11 February 1839, by rejecting both states' claims, choosing instead the Indian boundary line run and marked by John C. Sullivan in 1816 (the commonly accepted boundary before the dispute arose and the present boundary between the two states). The decision ended Atchison's claim to territory in the state of Iowa (no change).
    U.s.
    · Landers, 647-648; Thomas, 269-270
  5. 1857
    Lost territory Atchison lost to Nodaway.
    to Nodaway
    · Mo. Laws 1857, adj. sess., loc., pp. 386-387
  6. 1860
    Gained territory Atchison gained from Nodaway.
    from Nodaway
    · Mo. Laws 1859-1860, adj. sess., p. 464
  7. 1861
    Lost territory Atchison lost to Nodaway.
    to Nodaway
    · Mo. Laws 1860-1861, loc., p. 382

Land and parcels

What the maps cover in Atchison

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

Atchison by the Census

Population
5,305 2020 Census count
Housing units
2,731 2020 Census count
Land area
547 square miles
Water area
2.8 square miles
People per sq mi
10 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

Atchison 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 Atchison County

When was Atchison County founded?
Atchison County was founded in 1843, formed from Holt County, and named after David Rice Atchison.
What is the county seat of Atchison County?
The county seat of Atchison County is Rock Port.
Is there an online parcel map for Atchison County?
Yes. Atchison County publishes a parcel map of 6,178 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Atchison County's boundary or name changed?
Atchison County was created in 1843 from Holt County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Nodaway County, Allen County and Holt County. It was formerly called Allen.
Is my lot in a flood zone?
We do not have flood maps for Atchison 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