County · code 20139
Osage CountyKansas
Osage County is located in Kansas with its county seat at Lyndon. The county was created in 1855 and named after the Osage River.
- Founded1855
- County seatLyndon
- Named forOsage River, Missouri
- Land area706 sq mi + 14 sq mi water
- Population15,766 2020 Census
- Parcels mapped12,446 checked 16 October 2026
Where it is
Osage on the map of Kansas
Kansas has 105 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1855 from Shawnee County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Osage County was created on August 25, 1855, as Weller County from non-county area and initially attached to Shawnee County for civil and military purposes. The county was renamed Osage on February 11, 1859, fully organized, and detached from Shawnee County. Osage County became a county in the state of Kansas on January 29, 1861.
- 1855Osage County created Weller (now Osage) created by Kansas Territory from non-county area; Weller not fully organized, attached to Shawnee "for civil and military purposes." · Kans. Terr. Laws 1855, 1st leg., ch. 30, secs. 12, 34/pp. 207, 210
- 1859Renamed Weller renamed Osage. Osage fully organized, detached from Shawnee.formerly Weller· Andreas, 1532; HRS Kansas, Osage, 25-26, 70; Kans. Terr. Laws 1859, 5th leg., ch. 100/p. 573
- 1860
- 1860
- 1861Became part of Kansas Osage became a county in the state of Kansas. · U.S. Stat., vol. 12, ch. 20 [1861]/pp. 126-128; Van Zandt, 138-139
Show all 8 changes
- 1855Osage County created Weller (now Osage) created by Kansas Territory from non-county area; Weller not fully organized, attached to Shawnee "for civil and military purposes." · Kans. Terr. Laws 1855, 1st leg., ch. 30, secs. 12, 34/pp. 207, 210
- 1857Boundary clarified Weller (now Osage) boundaries redefined to run on federal land survey lines (no change).no change· Kans. Terr. Laws 1857, 2d leg., sec. 12/p. 40
- 1859Renamed Weller renamed Osage. Osage fully organized, detached from Shawnee.formerly Weller· Andreas, 1532; HRS Kansas, Osage, 25-26, 70; Kans. Terr. Laws 1859, 5th leg., ch. 100/p. 573
- 1860
- 1860
- 1861Became part of Kansas Osage became a county in the state of Kansas. · U.S. Stat., vol. 12, ch. 20 [1861]/pp. 126-128; Van Zandt, 138-139
- 1868Boundary clarified Osage boundaries redefined; mistake in description was not corrected until 8 April 1941 (no change).no change· Kans. Laws 1868, 8th leg., gen., ch. 24, sec. 54/p. 242; HRS Kansas, Osage, 3
- 1941Boundary clarified Osage boundaries redefined, correcting mistake of 3 March 1868 (no change).no change· Kans. Laws 1941, 49th leg., ch. 187/p. 292; HRS Kansas, Osage, 3
Land and parcels
What the maps cover in Osage
Who publishes each layer, how good it is, and when we last checked.
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Parcels Official
Lot lines and tax-map numbers for 12,446 parcels from Osage County Appraiser (owner oscoks; org osageco-appr; its web app is the state's listed Osage parcel search). Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 6 September 2022 · checked 16 October 2026 -
Address points Official
One point per address, 8,591 in all from Kansas 911 Coordinating Council NG911 program, hosted by DASC (Data Access and Support Center for the Kansas GIS Policy Board).
edited 13 July 2026 · checked 13 October 2026 -
Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- 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
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.
Records
Zoning and code
County government
- County government
The official website of Osage County.
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.
Questions
Common questions about Osage County
- When was Osage County founded?
- Osage County was founded in 1855, formed from Shawnee County, and named after Osage River, Missouri.
- What is the county seat of Osage County?
- The county seat of Osage County is Lyndon.
- Is there an online parcel map for Osage County?
- Yes. Osage County Appraiser (owner oscoks; org osageco-appr; its web app is the state's listed Osage parcel search) publishes a parcel map of 12,446 parcels, rated official 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 1855 from Shawnee County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Shawnee County, Coffey County and Weller County. It was formerly called Weller.
- 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