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ZIP Code 78665
Round Rock, TX, Williamson County
Population
66,171
Land area
24.1sq mi
People per sq mi
2,748
City
Round Rock
ZIP 78665 and nearby ZIP codes
ZIP 78665 at a glance
- ZIP 78665 (Round Rock) is about 24 times as dense as Texas as a whole.
- The median household income is $122,680, 56% above the Texas median of $78,476.
- A typical owner-occupied home is valued at $474,100 (67% above Texas) and median rent is $1,938 a month.
Local data for ZIP 78665
Counts from official public data
Housing and community stats
ZIP 78665, American Community Survey 2020-2024
Median household income
$122,680
Poverty rate
4.7%
Median home value
$474,100
Prices +3.5% in a year
Median rent
$1,938/mo
Homeownership
61.4%
Bachelor's or higher
53.6%
Median age
35.5
Average commute
27.8 min
Economy and federal money
Businesses, pandemic loans and political donations
Business establishments
981
ZIP Business Patterns 2023
Employees
16,807
$950M annual payroll
PPP loans
$74.1M
1,339 loans
Campaign donations
$282K
25% D, 37% R, 2026 cycle
Environment and hazard risk
ZIP 78665, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Moderate
Top: hail
Storm events since 1996
876
Countywide, mostly hail
Flood insurance policies
1,949
1.1% of homes, county
July high / Jan low
96° / 36°F
37.1 inches of rain a year
Health statistics
Share of adults in ZIP 78665, CDC PLACES estimates
Obesity
33.1%
U.S. 33.3% about the same
Diabetes
9.3%
U.S. 12.1% -2.8 pts
Smoking
9.7%
U.S. 12.8% -3.1 pts
Uninsured (18-64)
11.7%
U.S. 11.1% +0.6 pts
Frequently asked questions
- What city is ZIP code 78665?
- ZIP code 78665 is in Round Rock, TX (Williamson County).
- What county is ZIP code 78665 in?
- ZIP code 78665 is mostly in Williamson County, Texas.
- How many people live in ZIP code 78665?
- About 66,171 people live in the 78665 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.
Source: U.S. Census Bureau (ZIP Code Tabulation Areas, American Community Survey) · Data as of 12/31/2023. ZIP Code Tabulation Areas closely match, but are not identical to, USPS ZIP code delivery areas.