• county
  • FIPS 21003
  • Largest town: Scottsville

Allen County, Kentucky

Allen County had 22,037 residents in the Census Vintage 2024 estimate, on 343.7 square miles of land. It ranks 53rd of 120 in Kentucky by population and 49th by land area.

Population
22,037
#53 of 120 in Kentucky · #1,719 in US
Area
343.7 sq mi
#49 of 120 in Kentucky · #2,699 in US
Density
64 / sq mi
#57 of 120 in Kentucky · #1,251 in US
Median household income
$56,483
#57 of 120 in Kentucky · #2,186 in US

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

Allen County within Kentucky. Pin: Frankfort.

Measure from here

Tools and pages that start from Allen County

Allen County population, land area and income

Allen County had 22,037 residents in the Census Vintage 2024 estimate, on 343.7 square miles of land. It ranks 53rd of 120 in Kentucky by population and 49th by land area. That works out to 64.1 people per square mile, below the US average of 96.3, and above the national county median.

The median county-equivalent in Kentucky has 19,740 residents; Allen County is somewhat larger.

Its SAIPE 2023 median household income of $56,483 is below the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

22,037

3144th1st

1719th of 3,144 (US)

Land area

344 sq mi

3144th1st

2699th of 3,144 (US)

Density

64.1 / sq mi

3144th1st

1251st of 3,144 (US)

Median household income

$56,483

3143rd1st

2186th of 3,143 (US)

Rank within Kentucky (120)

Population

22,037

120th1st

53rd of 120 (KY)

Land area

344 sq mi

120th1st

49th of 120 (KY)

Density

64.1 / sq mi

120th1st

57th of 120 (KY)

Median household income

$56,483

120th1st

57th of 120 (KY)

How Allen County's population changed since 2020

Allen County gained 1,465 residents between the July 2020 and July 2024 estimates, a rise of 7.1%. That ranks 4th of 120 in Kentucky for growth. The median Kentucky county changed by +1.4%, and the state as a whole by +1.8%.

Since the April 2020 estimates base, Allen County recorded 1,118 births and 1,190 deaths, a natural change of -72. Net international migration added +32 and net domestic migration, people moving to or from other US counties, came to +1,465. The largest single component was domestic migration, which added 1,465 people.

20.6k202020.8k202121.2k202221.8k202322.0k2024
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
1,118
Deaths
1,190
Net international migration
+32
Net domestic migration
+1,465
Change, July 2023 to July 2024
+258

Where Allen County is

The Census internal point of Allen County is at 36.750800, -86.192500. It sits in UTM zone 16N. The map shades Kentucky's 120 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.

Adair County: +1.9%Kenton County: +3.3%Owen County: +1.2%Morgan County: +4.1%Bracken County: +1.1%Edmonson County: +4.0%Trigg County: +3.4%Jackson County: +3.0%Spencer County: +6.8%Clark County: +1.7%Jessamine County: +6.6%Green County: +3.8%Henry County: +3.2%Graves County: +0.8%Webster County: -1.3%Washington County: +1.9%Ohio County: +0.8%Knott County: -5.1%Meade County: +1.4%Carroll County: +2.5%Scott County: +7.2%Lincoln County: +2.7%Greenup County: -1.7%Boyle County: +2.1%Hardin County: +1.8%Nelson County: +4.1%Hart County: +3.2%Christian County: -2.4%Carlisle County: -0.6%Crittenden County: -0.2%Elliott County: -1.0%Garrard County: +6.3%Larue County: +1.7%Lee County: -0.7%Leslie County: -7.1%Hancock County: -1.0%Lewis County: -1.6%Lyon County: +4.6%McLean County: -0.1%Magoffin County: -4.2%Martin County: -4.9%Mason County: -1.1%Rockcastle County: +1.0%Menifee County: +3.2%Russell County: +2.6%Whitley County: +1.5%Todd County: +3.9%Union County: -3.5%Wolfe County: -2.9%Bell County: -3.9%Boyd County: -0.9%Butler County: +1.9%Metcalfe County: +2.7%Grant County: +2.8%Simpson County: +3.7%Pike County: -5.2%Gallatin County: +1.5%Harlan County: -6.4%Fayette County: +2.1%Logan County: +3.5%Muhlenberg County: -1.2%Bath County: +1.8%Mercer County: +3.8%Barren County: +2.5%Franklin County: +1.6%Bullitt County: +4.2%Boone County: +5.6%Campbell County: +0.9%Jefferson County: +1.4%Wayne County: +0.4%Ballard County: -1.1%Anderson County: +4.1%Pulaski County: +2.7%Knox County: -1.7%Laurel County: +1.0%Breckinridge County: +3.8%Oldham County: +4.2%Letcher County: -6.2%Lawrence County: -3.1%McCracken County: -0.6%Nicholas County: +3.7%Owsley County: -2.6%Powell County: -1.3%Bourbon County: +0.2%Calloway County: +3.7%Henderson County: -1.1%Clinton County: -0.5%Warren County: +9.6%Montgomery County: +2.4%Floyd County: -3.5%Woodford County: +3.1%Hopkins County: -0.3%Johnson County: -2.4%Marshall County: +0.1%Estill County: -1.1%Cumberland County: +3.2%Fleming County: +3.3%Madison County: +7.1%Carter County: -1.9%Allen County: +7.1%Daviess County: +1.0%Harrison County: +4.3%Perry County: -5.7%Fulton County: -3.5%Clay County: -3.5%Robertson County: +9.1%Trimble County: +1.5%Taylor County: +3.1%Shelby County: +3.9%McCreary County: -0.2%Breathitt County: -6.5%Livingston County: -0.6%Hickman County: -3.0%Rowan County: -0.2%Casey County: +0.2%Monroe County: -1.4%Marion County: +1.3%Grayson County: +2.3%Caldwell County: -0.2%Pendleton County: +1.3%
Change 2020 to 2024
  1. < -1.6%
  2. < +0.2%
  3. < +1.9%
  4. < +3.7%
  5. ≥ +3.7%
no data

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

Internal point

Decimal
36.750800, -86.192500
DMS
36°45'2.88"N 86°11'33.00"W
UTM
16N 572082.6E 4067532.3N
Geohash
dnd9ndk8c
Plus code
868MQR25+82

Towns in Allen County

One incorporated place of 1,000+ people has residents in Allen County, 4,574 people together, or 21% 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 Scottsville with 4,574.

  1. 01Scottsville4,574
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Allen County

The Census 2024 county adjacency file lists 6 neighbors for Allen County, including 2 across a state line. The most populous is Sumner County, TN, with 211,721 residents. Distances run between Census internal points in a straight line.

Distance to Frankfort and the nearest big city

Frankfort is 122.7 miles NE of Allen County's internal point in a straight line. The nearest place of 100,000 or more is Nashville-Davidson, TN (population 704,963), 51.8 miles away. The nearest place of 10,000 or more is Franklin, KY (population 10,524), 20.3 miles away.

Allen County FIPS code

The FIPS code of Allen County is 21003: state code 21 for Kentucky plus county code 003. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $56,483.

Questions people ask

What is the population of Allen County, Kentucky?

The Census Vintage 2024 estimate for July 1, 2024 is 22,037. That is up 1,465 people (7.1%) from the July 2020 estimate of 20,572.

What is the FIPS code of Allen County?

21003. The first two digits (21) are Kentucky; the last three (003) identify the county.

What is the largest town in Allen County?

Scottsville, with 4,574 residents inside Allen County in 2024.

Which counties border Allen County?

6 county-equivalents border it in the Census 2024 adjacency file: Sumner County, TN; Warren County, KY; Barren County, KY; Macon County, TN; Simpson County, KY; Monroe County, KY.

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.