Karnes County area

Population and density of Karnes County

The Census Bureau estimates that 15,018 people lived in Karnes County on July 1, 2025. That ranks #2,164 of 3,222 county equivalents nationally and #139 of 254 in Texas. Since the April 1, 2020 estimates base of 14,773, the population has grown by 245 (+1.7%), compared with +8.8% for Texas as a whole.

With 747.8 square miles of land, that is 20 people per square mile (7.8 per km²), placing Karnes County #2,323 nationally for density and #135 in Texas. The median county equivalent has 47 people per square mile; the Texas median is 22. Put another way, there are about 32 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 Karnes County

4 incorporated places lie at least partly in Karnes County. Together they are home to 8,273 people (55.1%); the other 6,745 (44.9%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Karnes City city, with 3,540 residents in the county. By land, Kenedy city is the largest at 4.413 mi².

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

Metropolitan area

Karnes 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

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

78111781137811678117781187811978140781417814478151

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 Karnes County

Karnes County shares a land border with 7 county equivalents. Each of them has more land than Karnes County. The largest neighbor is Atascosa County (1,219.5 mi²) and the smallest is Wilson County (803.7 mi²). Together with its neighbors, Karnes County forms a block of 7,518.6 mi² of land, of which it holds 9.9%.

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

Karnes County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.4 times as much. Texas’s county land could hold about 349 areas the size of Karnes County.

Another way to picture it: the same land area would fill a square about 27.3 miles (44 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 Karnes County?

Karnes County has more land than 2,041 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 Karnes County at #1,276 nationally by total area, 95 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 0.8%, compared with a national county-equivalent median of 1.2% — 0.4 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 Karnes 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.