County Maps US

Harper County, Oklahoma

A county in Oklahoma, ranked 75 of 77 by population.

CountyFIPS 40059

Within Oklahoma
Harper County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Buffalo, the county seat, located via the 2025 Census Gazetteer.

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Population
3,172
-74 (-2.3%) since 2020
Land area
1,039
square miles. A further 0.2% of the total area is water
Population density
3.1
people per square mile, computed rather than published
County seat
Buffalo
Seat of county government.
Established
1907
118 years ago
Largest city
Laverne town
Population 1,189.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Harper County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Harper County, Oklahoma from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 600 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Harper County ranks

Position among the 77 counties of Oklahoma, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn OklahomaNationally
Population3,17275th of 772,945th of 3,144
Land area1,039 sq mi17th of 77636th of 3,144
Population density3.1 per sq mi73rd of 772,900th of 3,144
Median household income$64,05319th of 771,700th of 3,143

Full data for Harper County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population3,172Vintage 2025 Population Estimates
Population in 20203,246Vintage 2025 Population Estimates
2020 estimates base?3,265Vintage 2025 Population Estimates
Land area1,039 sq mi2025 Gazetteer Files
Water area2.0 sq mi2025 Gazetteer Files
Total area1,041 sq mi2025 Gazetteer Files
Population density?3.1 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$64,053American Community Survey 2020-2024 5-Year Estimates
Median home value$99,200American Community Survey 2020-2024 5-Year Estimates
Median age40.9American Community Survey 2020-2024 5-Year Estimates
Households1,333American Community Survey 2020-2024 5-Year Estimates
Housing units1,714American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-4
33 births, 37 deaths
Net migration
-20
More people moved out than moved in.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Harper County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Woodward CountyOklahoma33 mi19,827
Beaver CountyOklahoma28 mi4,882
Clark CountyKansas26 mi1,900
Ellis CountyOklahoma22 mi3,613
Woods CountyOklahoma17 mi8,443
Comanche CountyKansas4.7 mi1,673

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 77 counties of Oklahoma

Open the interactive Oklahoma county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.