Rockwall County area

Population and density of Rockwall County

The Census Bureau estimates that 140,738 people lived in Rockwall County on July 1, 2025. That ranks #484 of 3,222 county equivalents nationally and #36 of 254 in Texas. Since the April 1, 2020 estimates base of 107,884, the population has grown by 32,854 (+30.5%), compared with +8.8% for Texas as a whole.

With 127.2 square miles of land, that is 1,106 people per square mile (427 per km²), placing Rockwall County #169 nationally for density and #9 in Texas. The median county equivalent has 47 people per square mile; the Texas median is 22. Put another way, there are about 0.579 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 Rockwall County

9 incorporated places lie at least partly in Rockwall County. Together they are home to 129,458 people (92%); the other 11,280 (8%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Rockwall city, with 53,980 residents in the county. By land, Dallas city is the largest at 339.6 mi² across all its counties. Among places with at least 1,000 residents in 2020, Royse City city grew fastest since then (+106.6%).

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

Metropolitan area

Rockwall County is a central county of the Dallas-Fort Worth-Arlington, TX Metropolitan Statistical Area, in the Dallas-Plano-Irving, TX metropolitan division. Its 11 county equivalents have 8,477,157 residents on 8,675.6 square miles of land; Rockwall County accounts for 1.5% of the land and 1.7% of the residents. By combined land it ranks #11 of 393 metropolitan areas, and #4 by population. It belongs to the Dallas-Fort Worth, TX-OK Combined Statistical Area.

ZIP codes

9 ZIP Code Tabulation Areas have land in Rockwall County; 3 of them have most of their land inside the county, and the others mainly cover neighboring areas.

750327508775088750897509875126751327516075189

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 Rockwall County

Rockwall County shares a land border with 4 county equivalents. Each of them has more land than Rockwall County. The largest neighbor is Dallas County (873.1 mi²) and the smallest is Kaufman County (780.7 mi²). Together with its neighbors, Rockwall County forms a block of 3,463.1 mi² of land, of which it holds 3.7%.

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

Rockwall County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 8.1 times as much. Texas’s county land could hold about 2,053 areas the size of Rockwall County.

Another way to picture it: the same land area would fill a square about 11.3 miles (18.2 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 Rockwall County?

Rockwall County has more land than 145 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 Rockwall County at #3,084 nationally by total area, 7 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 14.6%, compared with a national county-equivalent median of 1.2% — 13.4 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 Rockwall 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.