• county
  • FIPS 20001
  • Largest town: Iola

Allen County, Kansas

Allen County had 12,425 residents in the Census Vintage 2024 estimate, on 500.3 square miles of land. It ranks 36th of 105 in Kansas by population and 97th by land area.

Population
12,425
#36 of 105 in Kansas · #2,257 in US
Area
500.3 sq mi
#97 of 105 in Kansas · #2,082 in US
Density
25 / sq mi
#31 of 105 in Kansas · #2,069 in US
Median household income
$54,761
#88 of 105 in Kansas · #2,343 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Allen County within Kansas. Pin: Topeka.

Measure from here

Tools and pages that start from Allen County

Allen County population, land area and income

Allen County had 12,425 residents in the Census Vintage 2024 estimate, on 500.3 square miles of land. It ranks 36th of 105 in Kansas by population and 97th by land area. That works out to 24.8 people per square mile, below the US average of 96.3, and below the national county median.

The median county-equivalent in Kansas has 6,946 residents; Allen County is somewhat larger.

Its SAIPE 2023 median household income of $54,761 is below the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

12,425

3144th1st

2257th of 3,144 (US)

Land area

500 sq mi

3144th1st

2082nd of 3,144 (US)

Density

24.8 / sq mi

3144th1st

2069th of 3,144 (US)

Median household income

$54,761

3143rd1st

2343rd of 3,143 (US)

Rank within Kansas (105)

Population

12,425

105th1st

36th of 105 (KS)

Land area

500 sq mi

105th1st

97th of 105 (KS)

Density

24.8 / sq mi

105th1st

31st of 105 (KS)

Median household income

$54,761

105th1st

88th of 105 (KS)

How Allen County's population changed since 2020

Allen County lost 112 residents between the July 2020 and July 2024 estimates, a drop of 0.9%. That ranks 48th of 105 in Kansas for growth. The median Kansas county changed by -1.0%, and the state as a whole by +1.1%.

Since the April 2020 estimates base, Allen County recorded 577 births and 768 deaths, a natural change of -191. Net international migration added +90 and net domestic migration, people moving to or from other US counties, came to +0. The largest single component was natural change, which removed 191 people.

12.5k202012.5k202112.5k202212.5k202312.4k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
577
Deaths
768
Net international migration
+90
Net domestic migration
+0
Change, July 2023 to July 2024
-41

Where Allen County is

The Census internal point of Allen County is at 37.884200, -95.300900. It sits in UTM zone 15N. The map shades Kansas's 105 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Allen County outlined. Dots are towns of 1,000+ people with residents in it.

Harper County: -1.0%Phillips County: -4.6%Seward County: -2.7%Grant County: -3.1%Pawnee County: -3.8%Haskell County: -4.5%Ness County: -2.3%Logan County: -1.8%Wichita County: -3.6%Greenwood County: -1.7%Stanton County: -0.7%Edwards County: -5.3%Gray County: +1.6%Franklin County: +1.0%Saline County: -1.5%Allen County: -0.9%Lyon County: +1.3%Cloud County: -3.3%Brown County: -3.6%Rice County: -1.1%Lincoln County: -0.6%Osborne County: -4.0%Rooks County: -2.8%Russell County: -0.8%Jefferson County: +0.0%Jewell County: -1.0%Lane County: -5.6%Sheridan County: -1.9%Gove County: -2.1%Trego County: -1.1%Montgomery County: -3.0%Sumner County: +0.1%Graham County: -1.5%Marion County: -1.0%Washington County: +0.8%Stevens County: -4.0%Kiowa County: -0.7%Mitchell County: +0.4%Cheyenne County: +1.3%Ellis County: +0.2%Rush County: -4.6%Scott County: -4.3%Comanche County: +0.7%Wallace County: -2.6%Nemaha County: -2.0%Linn County: +2.6%Ford County: -0.4%Dickinson County: +1.4%Ellsworth County: -0.9%Labette County: -2.3%Cowley County: -1.0%Neosho County: -2.2%Wilson County: -2.2%Thomas County: -1.7%Greeley County: -9.6%Osage County: -0.0%Finney County: +0.1%Kearny County: -3.8%Kingman County: -6.4%Republic County: -1.3%Ottawa County: +2.1%Smith County: -0.5%Crawford County: -0.1%Elk County: -1.5%Miami County: +4.4%Hodgeman County: -3.7%Morris County: -1.7%Morton County: -8.1%Harvey County: -1.0%Meade County: -4.2%Sedgwick County: +2.1%Geary County: -3.6%Woodson County: +0.4%Bourbon County: +0.6%Chase County: -2.6%Pratt County: -0.0%Reno County: -0.8%Chautauqua County: -1.2%Norton County: -2.1%Marshall County: -0.7%Doniphan County: +1.4%Cherokee County: -0.9%Barton County: -2.3%Riley County: +0.8%Butler County: +2.6%Stafford County: -3.7%Anderson County: +0.9%Sherman County: -1.8%Rawlins County: -5.5%Pottawatomie County: +5.7%McPherson County: +0.5%Coffey County: -0.7%Hamilton County: +0.0%Atchison County: -0.5%Shawnee County: -0.4%Leavenworth County: +3.3%Jackson County: +2.2%Clark County: -5.3%Douglas County: +2.7%Clay County: -1.9%Barber County: -3.2%Johnson County: +3.5%Wabaunsee County: +3.2%Decatur County: -1.1%Wyandotte County: +0.3%
Change 2020 to 2024
  1. < -3.6%
  2. < -1.7%
  3. < -0.7%
  4. < +0.6%
  5. ≥ +0.6%
no data

Orange pin: Allen County internal point. Dark pin: Topeka.

Internal point

Decimal
37.884200, -95.300900
DMS
37°53'3.12"N 95°18'3.24"W
UTM
15N 297656.4E 4195462.5N
Geohash
9yspx2s52
Plus code
8696VMMX+MJ

Towns in Allen County

2 incorporated places of 1,000+ people have residents in Allen County, 7,126 people together, or 57% of the county. Each figure counts only the part of the town inside Allen County; towns marked "part" extend into another county. The largest is Iola with 5,309.

  1. 01Iola5,309
  2. 02Humboldt1,817
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Allen County

The Census 2024 county adjacency file lists 7 neighbors for Allen County. The most populous is Neosho County, KS, with 15,552 residents. Distances run between Census internal points in a straight line.

Distance to Topeka and the nearest big city

Topeka is 82.9 miles NNW of Allen County's internal point in a straight line. The nearest place of 100,000 or more is Olathe, KS (population 149,035), 73.7 miles away. The nearest place of 10,000 or more is Pittsburg, KS (population 20,547), 46.3 miles away.

Allen County FIPS code

The FIPS code of Allen County is 20001: state code 20 for Kansas plus county code 001. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $54,761.

Questions people ask

What is the population of Allen County, Kansas?

The Census Vintage 2024 estimate for July 1, 2024 is 12,425. That is down 112 people (0.9%) from the July 2020 estimate of 12,537.

What is the FIPS code of Allen County?

20001. The first two digits (20) are Kansas; the last three (001) identify the county.

What is the largest town in Allen County?

Iola, with 5,309 residents inside Allen County in 2024.

Which counties border Allen County?

7 county-equivalents border it in the Census 2024 adjacency file: Neosho County, KS; Bourbon County, KS; Linn County, KS; Wilson County, KS; Coffey County, KS; Anderson County, KS; Woodson County, KS.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.