ZIP codes in Starr County

11 ZIPs touch Starr County, Texas. The blue dashed line is the county border; orange ZIPs reach into it.

ZIP codes

cross the county line

72,272

people in these ZIPs

254

counties in TX

Most people

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Starr County ZIP list

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Questions people actually ask

How many ZIP codes are in Starr County, Texas?

11 ZIP codes reach into Starr County. 3 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Starr County has the most people?

78582 (Rio Grande City) has about 44,741 residents, the most of any ZIP touching Starr County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Starr County and another county?

Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Starr County. For one address, pin the exact spot on the ZIP finder to see its county.

Where does this list come from?

ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.

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Updated 2026-11-10 · Where the data comes from