• county
  • FIPS 21185
  • Largest town: La Grange

Oldham County, Kentucky

Oldham County had 70,525 residents in the Census Vintage 2024 estimate, on 187.3 square miles of land. It ranks 12th of 120 in Kentucky by population and 109th by land area.

Population
70,525
#12 of 120 in Kentucky · #784 in US
Area
187.3 sq mi
#109 of 120 in Kentucky · #3,017 in US
Density
377 / sq mi
#6 of 120 in Kentucky · #363 in US
Median household income
$120,818
#1 of 120 in Kentucky · #38 in US

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

Oldham County within Kentucky. Pin: Frankfort.

Measure from here

Tools and pages that start from Oldham County

Oldham County population, land area and income

Oldham County had 70,525 residents in the Census Vintage 2024 estimate, on 187.3 square miles of land. It ranks 12th of 120 in Kentucky by population and 109th by land area. That works out to 376.6 people per square mile, 3.9 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Kentucky has 19,740 residents, so Oldham County is 3.6 times that size.

Its SAIPE 2023 median household income of $120,818 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

70,525

3144th1st

784th of 3,144 (US)

Land area

187 sq mi

3144th1st

3017th of 3,144 (US)

Density

376.6 / sq mi

3144th1st

363rd of 3,144 (US)

Median household income

$120,818

3143rd1st

38th of 3,143 (US)

Rank within Kentucky (120)

Population

70,525

120th1st

12th of 120 (KY)

Land area

187 sq mi

120th1st

109th of 120 (KY)

Density

376.6 / sq mi

120th1st

6th of 120 (KY)

Median household income

$120,818

120th1st

1st of 120 (KY)

How Oldham County's population changed since 2020

Oldham County gained 2,829 residents between the July 2020 and July 2024 estimates, a rise of 4.2%. That ranks 12th 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, Oldham County recorded 2,307 births and 2,114 deaths, a natural change of +193. Net international migration added +469 and net domestic migration, people moving to or from other US counties, came to +2,240. The largest single component was domestic migration, which added 2,240 people.

67.7k202068.3k202169.5k202270.3k202370.5k2024
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
2,307
Deaths
2,114
Net international migration
+469
Net domestic migration
+2,240
Change, July 2023 to July 2024
+217

Where Oldham County is

The Census internal point of Oldham County is at 38.400100, -85.456100. 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 Oldham 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: Oldham County internal point. Dark pin: Frankfort.

Internal point

Decimal
38.400100, -85.456100
DMS
38°24'0.36"N 85°27'21.96"W
UTM
16N 634814.3E 4251336.8N
Geohash
dng4rqsbb
Plus code
86CPCG2V+2H

Towns in Oldham County

5 incorporated places of 1,000+ people have residents in Oldham County, 20,366 people together, or 29% of the county. Each figure counts only the part of the town inside Oldham County; towns marked "part" extend into another county. The largest is La Grange with 10,541.

  1. 01La Grange10,541
  2. 02Crestwood6,493
  3. 03Pewee Valley1,659
  4. 04Orchard Grass Hills1,610
  5. 05Prospect (part)63
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Oldham County

The Census 2024 county adjacency file lists 5 neighbors for Oldham County, including 1 across a state line. The most populous is Jefferson County, KY, with 793,881 residents. Distances run between Census internal points in a straight line.

Distance to Frankfort and the nearest big city

Frankfort is 34.8 miles ESE of Oldham County's internal point in a straight line. The nearest place of 100,000 or more is Louisville/Jefferson County, KY (population 640,796), 19.3 miles away. The nearest place of 10,000 or more is La Grange, KY (population 10,541), 4.3 miles away.

Oldham County FIPS code

The FIPS code of Oldham County is 21185: state code 21 for Kentucky plus county code 185. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $120,818.

Questions people ask

What is the population of Oldham County, Kentucky?

The Census Vintage 2024 estimate for July 1, 2024 is 70,525. That is up 2,829 people (4.2%) from the July 2020 estimate of 67,696.

What is the FIPS code of Oldham County?

21185. The first two digits (21) are Kentucky; the last three (185) identify the county.

What is the largest town in Oldham County?

La Grange, with 10,541 residents inside Oldham County in 2024.

Which counties border Oldham County?

5 county-equivalents border it in the Census 2024 adjacency file: Jefferson County, KY; Clark County, IN; Shelby County, KY; Henry County, KY; Trimble 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.