Miller County area

Population and density of Miller County

The Census Bureau estimates that 42,357 people lived in Miller County on July 1, 2025. That ranks #1,164 of 3,222 county equivalents nationally and #17 of 75 in Arkansas. Since the April 1, 2020 estimates base of 42,596, the population has declined by 239 (−0.6%), compared with +3.4% for Arkansas as a whole.

With 624.1 square miles of land, that is 68 people per square mile (26 per km²), placing Miller County #1,281 nationally for density and #17 in Arkansas. The median county equivalent has 47 people per square mile; the Arkansas median is 28. Put another way, there are about 9.4 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 Miller County

3 incorporated places lie at least partly in Miller County. Together they are home to 30,111 people (71.1%); the other 12,246 (28.9%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Texarkana city, with 29,123 residents in the county.

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

Metropolitan area

Miller County is a central county of the Texarkana, TX-AR Metropolitan Statistical Area. Its 3 county equivalents have 146,816 residents on 2,040.2 square miles of land; Miller County accounts for 30.6% of the land and 28.9% of the residents. By combined land it ranks #154 of 393 metropolitan areas, and #300 by population.

ZIP codes

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

718347183771838718397185475556

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 Miller County

Miller County shares a land border with 7 county equivalents, including 4 in Texas and Louisiana. It has more land than 2 of them. The largest neighbor is Cass County (936.9 mi²) and the smallest is Lafayette County (529.5 mi²). Together with its neighbors, Miller County forms a block of 5,953 mi² of land, of which it holds 10.5%.

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

Miller County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.7 times as much. Arkansas’s county land could hold about 83 areas the size of Miller County.

Another way to picture it: the same land area would fill a square about 25 miles (40.2 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 Miller County?

Miller County has more land than 1,678 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 Miller County at #1,621 nationally by total area, 77 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 2.2%, compared with a national county-equivalent median of 1.2% — 1.1 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 Miller 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.