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County · code 29151

Osage CountyMissouri

Osage County is a county in Missouri with its seat in Linn. It was created on January 29, 1841.

  • Founded1841
  • County seatLinn
  • Named forOsage River, Missouri
  • Land area607 sq mi + 6.9 sq mi water
  • Population13,274 2020 Census
  • Parcels mapped11,571 checked 16 October 2026
Open the free map Click any parcel in Osage County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

MariesGasconadeCallawayColeMillerMontgomery Linn Census outline · seat marked

Where it is

Osage 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 · Osage highlighted

History

Formed in 1841 from Gasconade County

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

Osage County was created from Gasconade County and named after the Osage River. It gained territory from Pulaski County in 1855, but lost land to the creation of Maries County and to Cole County the same year.

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

  1. 1841
    Osage County created Osage created from Gasconade.
    from Gasconade
    · Mo. Laws 1840-1841, pub., sec. 40/p. 37
  2. 1855
    Gained territory Osage gained from Pulaski.
    from Pulaski
    · Mo. Laws 1854-1855, pub., p. 12
  3. 1855
    Lost territory Osage lost to creation of Maries.
    to Maries
    · Mo. Laws 1854-1855, pub., pp. 13-15
  4. 1855
    Lost territory Osage lost to Cole.
    to Cole
    · Mo. Laws 1855, adj. sess., loc. and priv., p. 32

Land and parcels

What the maps cover in Osage

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

Osage by the Census

Population
13,274 2020 Census count
Housing units
6,492 2020 Census count
Land area
607 square miles
Water area
6.9 square miles
People per sq mi
22 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

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Permits

County government

See your own lot on these maps

Open Osage 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 Osage County

When was Osage County founded?
Osage County was founded in 1841, formed from Gasconade County, and named after Osage River, Missouri.
What is the county seat of Osage County?
The county seat of Osage County is Linn.
Is there an online parcel map for Osage County?
Yes. Osage County publishes a parcel map of 11,571 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Osage County's boundary or name changed?
Osage County was created in 1841 from Gasconade County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Cole County, Maries County and Pulaski County.
Who issues septic and well permits in Osage County?
The county's page on septic systems and wells: Health department: septic and well.
Is my lot in a flood zone?
We do not have flood maps for Osage 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