Oldham County area

Population and density of Oldham County

The Census Bureau estimates that 1,783 people lived in Oldham County on July 1, 2025. That ranks #3,137 of 3,222 county equivalents nationally and #234 of 254 in Texas. Since the April 1, 2020 estimates base of 1,759, the population has grown by 24 (+1.4%), compared with +8.8% for Texas as a whole.

With 1,500.5 square miles of land, that is 1.2 people per square mile (0.46 per km²), placing Oldham County #3,130 nationally for density and #240 in Texas. The median county equivalent has 47 people per square mile; the Texas median is 22. Put another way, there are about 539 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 Oldham County

2 incorporated places lie at least partly in Oldham County. Together they are home to 1,027 people (57.6%); the other 756 (42.4%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Vega city, with 891 residents in the county.

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

Metropolitan area

Oldham County is an outlying county of the Amarillo, TX Metropolitan Statistical Area. Its 5 county equivalents have 276,235 residents on 5,151 square miles of land; Oldham County accounts for 29.1% of the land and 0.6% of the residents. By combined land it ranks #49 of 393 metropolitan areas, and #186 by population. It belongs to the Amarillo-Borger, TX Combined Statistical Area.

ZIP codes

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

790017901079018790927909888430

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 Oldham County

Oldham County shares a land border with 5 county equivalents, including 1 in New Mexico. It has more land than 4 of them. The largest neighbor is Quay County (2,874 mi²) and the smallest is Moore County (899.7 mi²). Together with its neighbors, Oldham County forms a block of 9,141.4 mi² of land, of which it holds 16.4%.

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

Oldham County has more land than 1 of the 50 states. It is about 1.5 times the land area of Rhode Island (1,033.9 mi²), while Delaware, the next larger state, has 1.3 times as much land (1,948.6 mi²). Texas’s county land could hold about 174 areas the size of Oldham County.

Another way to picture it: the same land area would fill a square about 38.7 miles (62.3 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 Oldham County?

Oldham County has more land than 2,822 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 Oldham County at #451 nationally by total area, 51 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 0.1%, compared with a national county-equivalent median of 1.2% — 1.1 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 Oldham 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.