Starr County, TX ZIP Codes & Directory
Complete postal guide for Starr County, Texas. Featuring the official county seat of Rio Grande City, largest municipality Rio Grande City, and serving 2 incorporated municipal entities.
Municipalities Located in Starr County
Incorporated Cities, Towns, and Villages
Active USPS Postal Codes in Starr County
Standard delivery zones and geographic service boundaries
Frequently Asked Questions About Starr County, TX
What is the county seat and largest city in Starr County? ▾
The official county seat of Starr County is Rio Grande City, and its largest incorporated municipality by population is Rio Grande City.
How many cities, towns, and villages are in Starr County? ▾
Starr County encompasses 2 incorporated municipal entities, including 2 cities, 0 towns, and 0 villages.
What is the total population and land area of Starr County? ▾
According to official U.S. Census Bureau data, Starr County has a population of approximately 65,920 residents and spans an area of 1,223 square miles.
How many postal codes operate in Starr County? ▾
There are 1 active USPS postal codes serving addresses within Starr County, Texas.