Owyhee County area

Population and density of Owyhee County

The Census Bureau estimates that 12,661 people lived in Owyhee County on July 1, 2025. That ranks #2,310 of 3,222 county equivalents nationally and #28 of 44 in Idaho. Since the April 1, 2020 estimates base of 11,912, the population has grown by 749 (+6.3%), compared with +10.4% for Idaho as a whole.

With 7,668.2 square miles of land, that is 1.7 people per square mile (0.64 per km²), placing Owyhee County #3,093 nationally for density and #40 in Idaho. The median county equivalent has 47 people per square mile; the Idaho median is 10. Put another way, there are about 388 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 Owyhee County

3 incorporated places lie at least partly in Owyhee County. Together they are home to 4,829 people (38.1%); the other 7,832 (61.9%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Homedale city, with 3,138 residents in the county. Among places with at least 1,000 residents in 2020, Homedale city grew fastest since then (+8.7%).

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

Metropolitan area

Owyhee County is an outlying county of the Boise City, ID Metropolitan Statistical Area. Its 5 county equivalents have 864,243 residents on 11,766.6 square miles of land; Owyhee County accounts for 65.2% of the land and 1.5% of the residents. By combined land it ranks #6 of 393 metropolitan areas, and #75 by population. It belongs to the Boise City-Mountain Home-Ontario, ID-OR Combined Statistical Area.

ZIP codes

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

833028331683604836248362783628836398364183647836508983297910

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 Owyhee County

Owyhee County shares a land border with 7 county equivalents, including 3 in Oregon and Nevada. It has more land than 4 of them. The largest neighbor is Elko County (17,173.3 mi²) and the smallest is Canyon County (587 mi²). Together with its neighbors, Owyhee County forms a block of 51,006.1 mi² of land, of which it holds 15%.

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

Owyhee County has more land than 5 of the 50 states. It is about 1 times the land area of New Jersey (7,355 mi²), while Massachusetts, the next larger state, has 1 times as much land (7,801 mi²). Idaho’s county land could hold about 11 areas the size of Owyhee County.

Another way to picture it: the same land area would fill a square about 87.6 miles (140.9 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 Owyhee County?

Owyhee County has more land than 3,183 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 Owyhee County at #45 nationally by total area, 6 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 0.4%, compared with a national county-equivalent median of 1.2% — 0.8 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 Owyhee 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.