Ohio County area

Population and density of Ohio County

The Census Bureau estimates that 5,994 people lived in Ohio County on July 1, 2025. That ranks #2,805 of 3,222 county equivalents nationally and #92 of 92 in Indiana. Since the April 1, 2020 estimates base of 5,933, the population has grown by 61 (+1%), compared with +2.8% for Indiana as a whole.

With 86.2 square miles of land, that is 70 people per square mile (27 per km²), placing Ohio County #1,266 nationally for density and #59 in Indiana. The median county equivalent has 47 people per square mile; the Indiana median is 88. Put another way, there are about 9.2 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 Ohio County

1 incorporated place lies at least partly in Ohio County. Together they are home to 2,222 people (37.1%); the other 3,772 (62.9%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Rising Sun city, with 2,222 residents in the county.

Metropolitan area

Ohio County is an outlying county of the Cincinnati, OH-KY-IN Metropolitan Statistical Area. Its 15 county equivalents have 2,312,858 residents on 4,385.2 square miles of land; Ohio County accounts for 2% of the land and 0.3% of the residents. By combined land it ranks #60 of 393 metropolitan areas, and #30 by population. It belongs to the Cincinnati-Wilmington, OH-KY-IN Combined Statistical Area.

ZIP codes

5 ZIP Code Tabulation Areas have land in Ohio County; 1 of them have most of their land inside the county, and the others mainly cover neighboring areas.

4700147011470174701847040

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 Ohio County

Ohio County shares a land border with 4 county equivalents, including 1 in Kentucky. Each of them has more land than Ohio County. The largest neighbor is Ripley County (446.4 mi²) and the smallest is Switzerland County (220.7 mi²). Together with its neighbors, Ohio County forms a block of 1,304.6 mi² of land, of which it holds 6.6%.

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

Ohio County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 12 times as much. Indiana’s county land could hold about 416 areas the size of Ohio County.

Another way to picture it: the same land area would fill a square about 9.28 miles (14.9 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 Ohio County?

Ohio County has more land than 128 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 Ohio County at #3,118 nationally by total area, 24 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 1.5%, compared with a national county-equivalent median of 1.2% — 0.3 percentage points higher. 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 Ohio 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.