Spencer County area

Population and density of Spencer County

The Census Bureau estimates that 20,061 people lived in Spencer County on July 1, 2025. That ranks #1,883 of 3,222 county equivalents nationally and #73 of 92 in Indiana. Since the April 1, 2020 estimates base of 19,809, the population has grown by 252 (+1.3%), compared with +2.8% for Indiana as a whole.

With 396.9 square miles of land, that is 51 people per square mile (20 per km²), placing Spencer County #1,545 nationally for density and #77 in Indiana. The median county equivalent has 47 people per square mile; the Indiana median is 88. Put another way, there are about 13 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 Spencer County

7 incorporated places lie at least partly in Spencer County. Together they are home to 7,960 people (39.7%); the other 12,101 (60.3%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Santa Claus town, with 2,641 residents in the county. The county seat, Rockport city, has 1,966 residents. Among places with at least 1,000 residents in 2020, Santa Claus town grew fastest since then (+1.9%).

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

Metropolitan area

Spencer 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

16 ZIP Code Tabulation Areas have land in Spencer County; 11 of them have most of their land inside the county, and the others mainly cover neighboring areas.

47523475314753247537475414755047552475774757947588476014761147615476344763547637

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 Spencer County

Spencer County shares a land border with 5 county equivalents, including 2 in Kentucky. It has more land than 3 of them. The largest neighbor is Daviess County (458.4 mi²) and the smallest is Hancock County (187.7 mi²). Together with its neighbors, Spencer County forms a block of 2,236.6 mi² of land, of which it holds 17.7%.

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

Spencer County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 2.6 times as much. Indiana’s county land could hold about 90 areas the size of Spencer County.

Another way to picture it: the same land area would fill a square about 19.9 miles (32.1 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 Spencer County?

Spencer County has more land than 682 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 Spencer County at #2,598 nationally by total area, 58 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 1.2%, compared with a national county-equivalent median of 1.2%. The two percentages are within 0.1 percentage points of each other. 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 Spencer 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.