| ZIP Codes: | 9 ZIP Codes (5 Standard, 4 PO Box, 0 Unique) [See All] |
| Area Code: | 956 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:55:22 PM |
| Population: | 66,062 [See All] |
| FIPS: | 48427 |
| CBSA: | Rio Grande City-Roma, TX |
| Land Area: | 1,265 sq mi |
| Water Area: | 19 sq mi |
| Coordinates: | 26.5363, -98.7467 |
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66,062 residents live across 9 ZIPs covering 1,265 sq mi, served by 9 distinct USPS-recognized cities.
Population moved from 62,116 to 65,756 from 2014 to 2024 — a +5.9% change. 5 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 78582 (Rio Grande City, $42,626 median) and poorest ZIP 78545 (Falcon Heights, $24,550) are 25.6 miles apart — a 1.7× income gap across local geography.
Median home values vary 1.9× across this county — from $54,400 in 78548 (Grulla) to $102,800 in 78582 (Rio Grande City).
Density varies 23× across the county — from 11 people/sq mi in 78536 (Delmita) to 248 in 78545 (Falcon Heights).
Educational attainment ranges from 1.0% bachelor's+ in 78548 (Grulla) to 15.0% in 78584 (Roma) — the breadth of educational profiles across the area.
Within Texas, this is the #56 most populous of 254 counties and ranks #246 for median household income with the #79 fastest decade growth .
Weighted by population, the typical household earns about $38,170 across the county — reflecting what a typical resident sees, not a simple ZIP average.
13.6% of adults age 25+ hold a bachelor's degree or higher (5,046 of 37,194 reporting).
5 Standard delivery, 4 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 78582 | Rio Grande City | Standard | 44,741 | $42,626 | 766.9 | 6.2% |
| 78584 | Roma | Standard | 18,464 | $27,056 | 229.5 | 1.7% |
| 78548 | Grulla | PO Box | 1,341 | $37,308 | 11.7 | 243.0% |
| 78545 | Falcon Heights | PO Box | 392 | $24,550 | 1.6 | 40.5% |
| 78536 | Delmita | Standard | 371 | $28,393 | 33.9 | -7.5% |
| 78547 | Garciasville | PO Box | 306 | — | 0.1 | — |
| 78588 | San Isidro | Standard | 289 | $94,821 | 76.3 | 68.0% |
| 78591 | Santa Elena | Standard | 158 | $35,750 | 144.7 | -54.5% |
| 78585 | Salineno | PO Box | 0 | — | 0.0 | -100.0% |