Dawson County area

Dawson County, Texas covers 902.1 square miles: 900.3 square miles of land and 1.82 square miles of water. Its county seat is Lamesa. An estimated 11,776 people lived there in 2025.

Official Census measurements · GEOID 481152026 Gazetteer · retrieved September 27, 2026
Land area900.3 mi²
Water area1.82 mi²
Population (2025)11,776
People per mi²13

County outline

Generalized outline of Dawson County, Texas
2025 Census cartographic boundary, fitted to this frame. County maps are not at a common scale. The 2026 area measurements below come from the separate Gazetteer release. Map source and limitations.

Where Dawson County is located

Dawson County highlighted on a map of all U.S. county equivalents. About the maps

Area breakdown

Land accounts for 99.8% of Dawson County’s measured area and water for 0.2%. Its combined area converts to 2,336.5 square kilometers or approximately 577,363 acres.

Green: land · blue: water

MeasurementSquare milesSquare kilometersAcres
Land900.3092,331.79576,197.8
Water1.824.7141,164.8
Total902.1292,336.503577,362.6

How Dawson County compares

By original Census land area, Dawson County ranks #144 of 254 in Texas and #851 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.

Its land area is 0.991 times the Texas county-equivalent median of 908.7 square miles. It accounts for 0.3% of the combined county land area in the state.

See the complete Texas ranking · What counts as a county equivalent?

Population and density of Dawson County

The Census Bureau estimates that 11,776 people lived in Dawson County on July 1, 2025. That ranks #2,370 of 3,222 county equivalents nationally and #157 of 254 in Texas. Since the April 1, 2020 estimates base of 12,461, the population has declined by 685 (−5.5%), compared with +8.8% for Texas as a whole.

With 900.3 square miles of land, that is 13 people per square mile (5.1 per km²), placing Dawson County #2,533 nationally for density and #156 in Texas. The median county equivalent has 47 people per square mile; the Texas median is 22. Put another way, there are about 49 acres of land per resident.

Estimated population, 2020–2025 · line scaled to this county’s own range
July 1202020212022202320242025
Estimate12,47412,35912,16711,91211,85211,776
Change—−115−192−255−60−76

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 Dawson County

4 incorporated places lie at least partly in Dawson County. Together they are home to 8,373 people (71.1%); the other 3,403 (28.9%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Lamesa city, with 8,103 residents in the county.

Incorporated placePopulation 2025Since 2020Land mi²
Lamesa cityCounty seat8,103−6.9%5.116
Ackerly cityAlso in 1 other county161−4.7%0.311
O'Donnell cityAlso in 1 other county89−8.2%0.86
Los Ybanez city20−9.1%0.083

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

Metropolitan area

Dawson 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

4 ZIP Code Tabulation Areas have land in Dawson County; 2 of them have most of their land inside the county, and the others mainly cover neighboring areas.

79331793517937779713

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 Dawson County

Dawson County shares a land border with 5 county equivalents. It has more land than 3 of them. The largest neighbor is Gaines County (1,502.4 mi²) and the smallest is Terry County (888.9 mi²). Together with its neighbors, Dawson County forms a block of 5,995.8 mi² of land, of which it holds 15%.

Map of Dawson County and the 5 county equivalents that border it Borden County, Texas: 897.4 mi² landGaines County, Texas: 1,502.4 mi² landMartin County, Texas: 915 mi² landLynn County, Texas: 891.9 mi² landTerry County, Texas: 888.9 mi² land
Dawson County (dark) and its bordering county equivalents. Select a neighbor to open its profile. Drawn from the 2025 Census cartographic boundaries in an equal-area projection. How borders are determined.
Bordering county equivalentLand mi²Size vs. DawsonCompare
Gaines County1,502.41.7× largerCompare
Martin County915about the sameCompare
Borden County897.4about the sameCompare
Lynn County891.9about the sameCompare
Terry County888.9about the sameCompare

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

Dawson County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.1 times as much. Texas’s county land could hold about 290 areas the size of Dawson County.

Land area: Dawson County and the closest-sized states
Dawson County900.3 mi²
Rhode Island1,033.9 mi²

Another way to picture it: the same land area would fill a square about 30 miles (48.3 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 Dawson County?

Dawson County has more land than 2,371 of the other 3,221 county equivalents in the dataset.

Land area compared with the typical county equivalent
Dawson County900.3 mi²
Texas median908.7 mi²
National median604.5 mi²

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 Dawson County at #960 nationally by total area, 109 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 0.2%, compared with a national county-equivalent median of 1.2% — 1 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 Dawson County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Land rankCounty equivalentLand mi²Comparison
#850Midland County, Texas900.4Compare
#851Dawson County, Texas900.3This county
#852Glasscock County, Texas900.2Compare

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.

Representative coordinates

The Census internal point is 32.742528, -101.948771. It represents a location inside the geography; it is not necessarily the centroid or the address of a courthouse.

Source and precision

U.S. Census Bureau, 2026 Gazetteer Files, Counties. Original ALAND: 2,331,789,615 m²; AWATER: 4,712,668 m². Rankings use ALAND; exact ties use ascending GEOID. Tables preserve Census-published square miles to three decimals, with conversions based on those values.

Download the official county source ZIP ↗ · Methodology

Common questions

How big is Dawson County?

Dawson County, Texas has 900.3 square miles (2,331.8 km²) of land and 1.82 square miles of water, for a total area of 902.1 square miles. It ranks #851 of 3,222 U.S. county equivalents by land area.

Is Dawson County the largest county in Texas?

No. Dawson County ranks #144 of 254 in Texas by land area. The largest is Brewster County, with 6,183.8 square miles of land.

What counties border Dawson County?

Dawson County shares a land border with Borden County, Gaines County, Martin County, Lynn County, and Terry County.

What is the population of Dawson County?

The Census Bureau estimates Dawson County had 11,776 residents on July 1, 2025, ranking #2,370 of 3,222 county equivalents. That is 13 people per square mile of land.

What is the county seat of Dawson County?

The county seat of Dawson County is Lamesa.

What cities and towns are in Dawson County?

Dawson County has 4 incorporated places. The most populous are Lamesa city, Ackerly city, O'Donnell city, and Los Ybanez city; 3,403 residents live outside any incorporated place.

Is Dawson County part of a metropolitan area?

No. Dawson County is outside every metropolitan and micropolitan statistical area in the July 2023 OMB delineation.

How many ZIP codes are in Dawson County?

4 ZIP Code Tabulation Areas have land in Dawson County, and 2 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.

How does Dawson County compare with U.S. states?

It has less land than every state. Rhode Island, the smallest, has 1.1 times as much land.

How many acres of land are in Dawson County?

The land measurement converts to approximately 576,198 acres. Including water, total area is approximately 577,363 acres. One square mile equals 640 acres.

Why might another source show a different area?

Check whether it reports land or total area, its Census vintage, and its rounding. Our guide explains how to reconcile county area figures.

Can this establish a property boundary?

No. Statistical measurements and generalized maps do not establish property lines. Consult the relevant local surveying or land-records authority.

Cite this county

Download the complete CSV or JSON dataset