Posey County area

Population and density of Posey County

The Census Bureau estimates that 24,988 people lived in Posey County on July 1, 2025. That ranks #1,668 of 3,222 county equivalents nationally and #63 of 92 in Indiana. Since the April 1, 2020 estimates base of 25,227, the population has declined by 239 (−0.9%), compared with +2.8% for Indiana as a whole.

With 409.4 square miles of land, that is 61 people per square mile (24 per km²), placing Posey County #1,371 nationally for density and #63 in Indiana. The median county equivalent has 47 people per square mile; the Indiana median is 88. Put another way, there are about 10 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 Posey County

5 incorporated places lie at least partly in Posey County. Together they are home to 8,626 people (34.5%); the other 16,362 (65.5%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Mount Vernon city, with 6,289 residents in the county.

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

Metropolitan area

Posey County is an outlying county of the Evansville, IN Metropolitan Statistical Area. Its 3 county equivalents have 273,786 residents on 1,027.4 square miles of land; Posey County accounts for 39.8% of the land and 9.1% of the residents. By combined land it ranks #276 of 393 metropolitan areas, and #187 by population. It belongs to the Evansville-Henderson, IN-KY Combined Statistical Area.

ZIP codes

7 ZIP Code Tabulation Areas have land in Posey County; 4 of them have most of their land inside the county, and the others mainly cover neighboring areas.

47612476164762047631476334763847712

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 Posey County

Posey County shares a land border with 6 county equivalents, including 4 in Illinois and Kentucky. It has more land than 3 of them. The largest neighbor is White County (495 mi²) and the smallest is Vanderburgh County (233.4 mi²). Together with its neighbors, Posey County forms a block of 2,727.3 mi² of land, of which it holds 15%.

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

Posey County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 2.5 times as much. Indiana’s county land could hold about 88 areas the size of Posey County.

Another way to picture it: the same land area would fill a square about 20.2 miles (32.6 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 Posey County?

Posey County has more land than 755 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 Posey County at #2,495 nationally by total area, 28 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 2.4%, compared with a national county-equivalent median of 1.2% — 1.3 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 Posey 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.