ZIP Code 78665 – Round Rock, Texas | ZipsCode.us
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ZIP Code 78665
Round Rock, Texas · Williamson
ZIP code 78665 belongs to the city of Round Rock in Texas (Williamson). See all Texas ZIP Codes.
ZIP code 78665 belongs to Round Rock, Texas, in Williamson. If you are mailing a letter or package to this area, use Round Rock, TX 78665 in the address. On this page you will find the city and county for 78665, nearby ZIP codes in the same county, and free tools to look up any address in this ZIP code.
What City Is ZIP Code 78665?
The city for ZIP code 78665 is Round Rock, Texas. When you write an address in this area, the correct format is: Name, Street Address, Round Rock, TX 78665.
ZIP Code 78665 County and State
ZIP code 78665 is located in Williamson, Texas. For a complete list of cities and ZIP codes across the state, see the Texas ZIP Codes page.
Nearby ZIP Codes in Williamson
These ZIP codes are in the same county as 78665:
ZIP Code 78665 on the Map
The map below shows the approximate center of ZIP code 78665, near Round Rock, Texas. You can zoom in and drag the map to explore the area.
Map center is approximate (ZIP area center, around 30.5145, -97.668). Map data © OpenStreetMap.
Population and Demographics of ZIP Code 78665
According to public U.S. Census Bureau data, ZIP code 78665 is home to a community in Texas. The figures below come from the U.S. Census and the American Community Survey (ACS).
Source: U.S. Census Bureau, American Community Survey (ACS) 2023 5-year estimates and 2023 Gazetteer. Figures are estimates and change with each new survey.
Find an Address in ZIP Code 78665
Need the full ZIP+4 code for a specific street address in Round Rock? Use the free ZIP+4 Lookup tool, or find any ZIP code from a street address with the ZIP Code by Address tool.
Frequently Asked Questions
What city is ZIP code 78665?
ZIP code 78665 is for Round Rock, Texas.
What county is ZIP code 78665 in?
ZIP code 78665 is in Williamson, Texas.
What state is ZIP code 78665 in?
ZIP code 78665 is in Texas (TX).
How do I find the ZIP+4 for an address in 78665?
Use the free ZIP+4 Lookup tool with the full street address to get the complete 9-digit ZIP code.
What are the nearby ZIP codes to 78665?
Nearby ZIP codes include 76527 (Florence), 76530 (Granger), 76537 (Jarrell), 76573 (Schwertner), 76574 (Taylor).
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