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County · code 20103

Leavenworth CountyKansas

Leavenworth County is in Kansas, with its seat in Leavenworth. The county was created in 1855 and named after Henry Leavenworth.

  • Founded1855
  • County seatLeavenworth
  • Named forHenry Leavenworth
  • Land area463 sq mi + 5.5 sq mi water
  • Population81,881 2020 Census
  • Parcels mapped33,563 checked 14 October 2026
Open the free map Click any parcel in Leavenworth County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

WyandottePlatte, MOJeffersonJohnsonDouglasAtchison Leavenworth Census outline · seat marked

Where it is

Leavenworth on the map of Kansas

Kansas has 105 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Kansas · Leavenworth highlighted

History

Founded in 1855

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

Leavenworth County was created on August 25, 1855, by Kansas Territory from non-county area. On January 29, 1859, Leavenworth County lost territory to the creation of Wyandotte County. When Kansas became a state on January 29, 1861, Leavenworth became a county in the state.

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

  1. 1855
    Leavenworth County created Leavenworth created by Kansas Territory from non-county area. · Kans. Terr. Laws 1855, 1st leg., ch. 30, sec. 27/p. 209
  2. 1857
    Boundary clarified Leavenworth boundaries redefined to run on federal land survey lines (no change).
    no change
    · Kans. Terr. Laws 1857, 2d leg., sec. 27/pp. 43-44 and p. 88
  3. 1859
    Lost territory Leavenworth lost to creation of Wyandotte.
    to Wyandotte
    · Kans. Terr. Laws 1859, 5th leg., ch. 47/pp. 362-364
  4. 1861
    Became part of Kansas Leavenworth became a county in the state of Kansas. · U.S. Stat., vol. 12, ch. 20 [1861]/pp. 126-128; Van Zandt, 138-139

Land and parcels

What the maps cover in Leavenworth

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

Leavenworth by the Census

Population
81,881 2020 Census count
Housing units
31,219 2020 Census count
Land area
463 square miles
Water area
5.5 square miles
People per sq mi
177 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

Zoning and code

GIS and maps

County government

See your own lot on these maps

Open Leavenworth 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 Leavenworth County

When was Leavenworth County founded?
Leavenworth County was founded in 1855, and named after Henry Leavenworth.
What is the county seat of Leavenworth County?
The county seat of Leavenworth County is Leavenworth.
Is there an online parcel map for Leavenworth County?
Yes. Leavenworth County, KS GIS (owner lvcoks; county Hub 'Leavenworth County GIS', linked from leavenworthcounty.gov; org profile not public) publishes a parcel map of 33,563 parcels, rated official here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Leavenworth County's boundary or name changed?
Leavenworth County was created in 1855. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Wyandotte County.
Who issues building permits in Leavenworth County?
The county's page on building permits: Building Permit. Inside a city or town, ask that city first.
Who issues septic and well permits in Leavenworth 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 Leavenworth 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