Harper County area

Population and density of Harper County

The Census Bureau estimates that 3,172 people lived in Harper County on July 1, 2025. That ranks #3,022 of 3,222 county equivalents nationally and #75 of 77 in Oklahoma. Since the April 1, 2020 estimates base of 3,265, the population has declined by 93 (−2.8%), compared with +4.1% for Oklahoma as a whole.

With 1,038.6 square miles of land, that is 3.1 people per square mile (1.2 per km²), placing Harper County #2,978 nationally for density and #73 in Oklahoma. The median county equivalent has 47 people per square mile; the Oklahoma median is 28. Put another way, there are about 210 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Harper County

4 incorporated places lie at least partly in Harper County. Together they are home to 2,269 people (71.5%); the other 903 (28.5%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Laverne town, with 1,189 residents in the county. The county seat, Buffalo town, has 1,002 residents. By land, Buffalo town is the largest at 1.113 mi².

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Harper County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.

Metropolitan area

Harper County is not part of any metropolitan or micropolitan statistical area in the Office of Management and Budget’s July 2023 delineation; 1,306 other county equivalents are also outside one. These areas are built around an urban core of at least 10,000 people plus the counties tied to it by commuting, so counties outside them are generally rural.

ZIP codes

7 ZIP Code Tabulation Areas have land in Harper County; 2 of them have most of their land inside the county, and the others mainly cover neighboring areas.

73801738347384273844738487385173855

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Harper County

Harper County shares a land border with 6 county equivalents, including 2 in Kansas. It has more land than 2 of them. The largest neighbor is Beaver County (1,814.8 mi²) and the smallest is Comanche County (788.3 mi²). Together with its neighbors, Harper County forms a block of 8,377.1 mi² of land, of which it holds 12.4%.

How big is Harper County compared with U.S. states?

Harper County has more land than 1 of the 50 states. It is about 1 times the land area of Rhode Island (1,033.9 mi²), while Delaware, the next larger state, has 1.9 times as much land (1,948.6 mi²). Oklahoma’s county land could hold about 66 areas the size of Harper County.

Another way to picture it: the same land area would fill a square about 32.2 miles (51.9 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Harper County?

Harper County has more land than 2,586 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Harper County at #732 nationally by total area, 96 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.

Its water share is 0.2%, compared with a national county-equivalent median of 1.2% — 1 percentage points lower. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Harper County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.