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County · code 20001

Allen CountyKansas

Allen County is a county in Kansas, with its seat in Iola, created in 1855.

  • Founded1855
  • County seatIola
  • Named forWilliam Allen
  • Land area500 sq mi + 5 sq mi water
  • Population12,526 2020 Census
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Updated

NeoshoAndersonWoodsonBourbon Iola Census outline · seat marked

Where it is

Allen on the map of Kansas

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

Anderson CountyAtchison CountyBarber CountyBarton CountyBourbon CountyBrown CountyButler CountyChase CountyChautauqua CountyCherokee CountyCheyenne CountyClark CountyClay CountyCloud CountyCoffey CountyComanche CountyCowley CountyCrawford CountyDecatur CountyDickinson CountyDoniphan CountyDouglas CountyEdwards CountyElk CountyEllis CountyEllsworth CountyFinney CountyFord CountyFranklin CountyGeary CountyGove CountyGraham CountyGrant CountyGray CountyGreeley CountyGreenwood CountyHamilton CountyHarper CountyHarvey CountyHaskell CountyHodgeman CountyJackson CountyJefferson CountyJewell CountyJohnson CountyKearny CountyKingman CountyKiowa CountyLabette CountyLane CountyLeavenworth CountyLincoln CountyLinn CountyLogan CountyLyon CountyMcPherson CountyMarion CountyMarshall CountyMeade CountyMiami CountyMitchell CountyMontgomery CountyMorris CountyMorton CountyNemaha CountyNeosho CountyNess CountyNorton CountyOsage CountyOsborne CountyOttawa CountyPawnee CountyPhillips CountyPottawatomie CountyPratt CountyRawlins CountyReno CountyRepublic CountyRice CountyRiley CountyRooks CountyRush CountyRussell CountySaline CountyScott CountySedgwick CountySeward CountyShawnee CountySheridan CountySherman CountySmith CountyStafford CountyStanton CountyStevens CountySumner CountyThomas CountyTrego CountyWabaunsee CountyWallace CountyWashington CountyWichita CountyWilson CountyWoodson CountyWyandotte CountyAllen County Allen
Counties of Kansas · Allen highlighted

History

Formed in 1855 from Dorn County, Neosho County, Godfrey County, Seward County, Greenwood County, Hunter County, Wilson County, Woodson County, Marion County and Washington County

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

Allen County was created in 1855 from non-county area, named after William Allen, and was fully organized the following year. Between 1857 and 1865, Allen County underwent boundary adjustments, losing territory to newly organized counties including Neosho, Wilson, and others, though it gained some land back from Neosho in 1870.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1855
    Allen County created Allen created by Kansas Territory from non-county area; Allen not fully organized. Dorn (now Neosho), Godfrey (later Seward original, extinct), Greenwood, Hunter (extinct), Wilson, and Woodson not fully organized, attached to Allen "for civil and military purposes." Marion and Washington not fully organized, attached to Allen "for judicial and other purposes."
    from Dornfrom Neoshofrom Godfreyfrom Sewardfrom Greenwoodfrom Hunterfrom Wilsonfrom Woodsonfrom Marionfrom Washington
    · Kans. Terr. Laws 1855, 1st leg., ch. 30, secs. 9, 34/pp. 206, 210 and ch. 33/pp. 214-215
  2. 1856
    Changed Allen fully organized. · Andreas, 670; Kansas Counties, KSHS, http://www.kshs.org/genealogists/places/counties.htm, 20 October 2004
  3. 1861
    Became part of Kansas Allen became a county in the state of Kansas. · U.S. Stat., vol. 12, ch. 20 [1861]/pp. 126-128; Van Zandt, 138-139
  4. 1865
    Lost territory Allen lost to Neosho and Wilson.
    to Neoshoto Wilson
    · Kans. Laws 1865, 5th leg., chs. 16-17/pp. 45-46
  5. 1870
    Gained territory Allen gained from Neosho.
    from Neosho
    · Kans. Laws 1870, 10th leg., ch. 39/pp. 88-89
Show all 11 changes (6 more)
  1. 1855
    Allen County created Allen created by Kansas Territory from non-county area; Allen not fully organized. Dorn (now Neosho), Godfrey (later Seward original, extinct), Greenwood, Hunter (extinct), Wilson, and Woodson not fully organized, attached to Allen "for civil and military purposes." Marion and Washington not fully organized, attached to Allen "for judicial and other purposes."
    from Dornfrom Neoshofrom Godfreyfrom Sewardfrom Greenwoodfrom Hunterfrom Wilsonfrom Woodsonfrom Marionfrom Washington
    · Kans. Terr. Laws 1855, 1st leg., ch. 30, secs. 9, 34/pp. 206, 210 and ch. 33/pp. 214-215
  2. 1856
    Changed Allen fully organized. · Andreas, 670; Kansas Counties, KSHS, http://www.kshs.org/genealogists/places/counties.htm, 20 October 2004
  3. 1857
    Changed Woodson detached from Allen, attached to Coffey "for civil and military purposes."
    WoodsonCoffey
    · Kans. Terr. Laws 1857, 2d leg., sec. 9/pp. 94-95
  4. 1857
    Boundary clarified Allen boundaries redefined to run on federal land survey lines (no change). Washington re-created, ending it's attachment to Allen.
    with Washingtonno change
    · Kans. Terr. Laws 1857, 2d leg., secs. 9, 33/pp. 39-40, 45
  5. 1859
    Changed Dorn (now Neosho) detached from Allen, attached to Bourbon; Godfrey (later Seward original, extinct) and Greenwood detached from Allen, attached to Coffey; Hunter (extinct) detached from Allen, attached to Breckenridge (now Lyon); Wilson remained attached to Allen. All attachments were "for judicial purposes."
    DornNeoshoBourbonGodfreySewardGreenwoodCoffeyHunterBreckenridgeLyonWilson
    · Kans. Terr. Laws 1859, 5th leg., ch. 40, sec. 4/p. 330
  6. 1860
    Changed Marion detached from Allen, attached to Chase "for judicial and county purposes."
    MarionChase
    · Kans. Terr. Laws 1860, ch. 40/p. 80
  7. 1860
    Changed Dorn (now Neosho) detached from Bourbon, attached to Allen "for judicial purposes." Wilson detached from Allen, attached to Coffey "for judicial purposes."
    DornNeoshoBourbonWilsonCoffey
    · Kans. Terr. Laws 1860, ch. 78, sec. 4/p. 133; HRS Kansas, Bourbon, 10
  8. 1861
    Became part of Kansas Allen became a county in the state of Kansas. · U.S. Stat., vol. 12, ch. 20 [1861]/pp. 126-128; Van Zandt, 138-139
  9. 1864
    Changed Neosho fully organized, detached from Allen.
    Neosho
    · Andreas, 825
  10. 1865
    Lost territory Allen lost to Neosho and Wilson.
    to Neoshoto Wilson
    · Kans. Laws 1865, 5th leg., chs. 16-17/pp. 45-46
  11. 1870
    Gained territory Allen gained from Neosho.
    from Neosho
    · Kans. Laws 1870, 10th leg., ch. 39/pp. 88-89

Land and parcels

What the maps cover in Allen

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

Allen by the Census

Population
12,526 2020 Census count
Housing units
6,054 2020 Census count
Land area
500 square miles
Water area
5 square miles
People per sq mi
25 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

Allen 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 Allen County

When was Allen County founded?
Allen County was founded in 1855, formed from Dorn County, Neosho County, Godfrey County, Seward County, Greenwood County, Hunter County, Wilson County, Woodson County, Marion County and Washington County, and named after William Allen.
What is the county seat of Allen County?
The county seat of Allen County is Iola.
Is there an online parcel map for Allen County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Allen County's boundary or name changed?
Allen County was created in 1855 from Dorn County, Neosho County, Godfrey County, Seward County, Greenwood County, Hunter County, Wilson County, Woodson County, Marion County and Washington County. Since then the Atlas of Historical County Boundaries records 9 later changes, chiefly involving Neosho County, Coffey County and Wilson County.
Is my lot in a flood zone?
We do not have flood maps for Allen 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