Zip Code 78681
Round Rock, Texas — Williamson County
📍 ZIP code 78681 is in Round Rock, Williamson County, Texas.
ZIP code 78681 is located in Round Rock, Williamson County, Texas. It is a zip code in the Central (CST/CDT) Time Zone with an estimated population of 58,531. The area code for ZIP code 78681 is 512.
Quick Answer
Zip code 78681 is in Round Rock, Texas (Williamson County). It has a population of 58,531, median household income of $136,215, and median home value of $460,000.
Population
58,531
Income
$136,215
Home Value
$460,000
Climate
96°F / 38°F
About Zip Code 78681
Zip code 78681 is located in Round Rock, Texas, within Williamson County. Home to approximately 58,531 residents, this area sits at an elevation of 788 ft and falls within the Central (CST/CDT) timezone. The local area code is 512.
The median household income is $136,215 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $460,000, and the cost of living index is 156 (56% above the national average of 100).
Summers average a high of 96°F while winters drop to 38°F. The area receives about 37 in of rain annually. The zip code covers 21.8 square miles of land area and 0.2 square miles of water.
Key Statistics
58,531
$136,215
$460,000
Central (CST/CDT)
512
788 ft
21.8 sq mi
39
20,817
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Compare With Nearby Zip Codes
| Metric | 78681 | 78717 | 78664 | 78729 | 78728 | 78613 |
|---|---|---|---|---|---|---|
| City | Round Rock, TX | Austin, TX | Round Rock, TX | Austin, TX | Austin, TX | Cedar Park, TX |
| Population | 58,531 | 36,085 | 62,272 | 30,440 | 26,776 | 89,162 |
| Median Income | $136,215 | $140,483 | $85,919 | $81,589 | $74,048 | $120,829 |
| Home Value | $460,000 | $599,200 | $317,400 | $434,500 | $392,600 | $461,900 |
| Cost of Living | 156 | 187 | 105 | 124 | 113 | 151 |
| Median Age | 39 | 36.3 | 34.8 | 35.1 | 33.9 | 37.3 |
Cost of Living
100 = National Average. Round Rock's cost of living is 56% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
3.4x
Demographics
Zip code 78681 has a population of 58,531 people with a median age of 39. There are 20,817 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Round Rock (78681) population trend from 2010 to 2024
↓ -25.7%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
96°F
38°F
37 in
0 in
Round Rock experiences hot summers with average highs around 96°F. Winters are mild with lows averaging 38°F. The area receives virtually no snowfall.
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Housing & Economy
Median Home Value
$460,000
Median Household Income
$136,215
With 20,817 housing units across 21.8 square miles, 78681 has a housing density of 955 units per square mile. The home price-to-income ratio is 3.4x.
Location & Geography
Latitude
30.5344°
Longitude
-97.7257°
Land Area
21.8 sq mi
Water Area
0.2 sq mi
Nearby Zip Codes
Zip codes closest to 78681 (Round Rock, TX) with distances:
All Zip Codes in Round Rock, TX
Other zip codes serving Round Rock:
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ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 78681's $136,215. A way to compare Round Rock to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 78681 (Round Rock, TX). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Round Rock, Texas?
Round Rock, Texas uses zip code 78681 along with 1 other zip codes.
What county is zip code 78681 in?
Zip code 78681 is located in Williamson County, Texas.
What is the population of zip code 78681?
The population of zip code 78681 is 58,531 with a median age of 39.
Is 78681 in Round Rock, Texas?
Yes, zip code 78681 is in Round Rock, Williamson County, Texas. The area code is 512.
Frequently Asked Questions
What city is zip code 78681 in?
Zip code 78681 is in Round Rock, Texas. It is part of Williamson County and uses the Central (CST/CDT) timezone.
What is zip code 78681?
Zip code 78681 is a U.S. postal code in Round Rock, Texas (Williamson County). It has a population of 58,531 and covers 21.8 square miles.
What is the population of zip code 78681?
The population of zip code 78681 (Round Rock, TX) is 58,531 with a median age of 39. There are approximately 20,817 housing units in this area.
What is the median income in zip code 78681?
The median household income in zip code 78681 (Round Rock, TX) is $136,215 per year. The cost of living index is 156 (100 = national average).
What is the average home price in zip code 78681?
The median home value in zip code 78681 (Round Rock, TX) is $460,000. The cost of living index is 156 compared to the national average of 100.
What county is zip code 78681 in?
Zip code 78681 is located in Williamson County, Texas. The primary city is Round Rock.
What is the area code for zip code 78681?
Zip code 78681 in Round Rock, TX uses area code 512. It is located in the Central (CST/CDT) timezone.
Is zip code 78681 a good place to live?
Zip code 78681 (Round Rock, TX) has a cost of living index of 156 (100 = national average), a median household income of $136,215, and median home values of $460,000. The median age is 39. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 78681?
The cost of living index for zip code 78681 (Round Rock, TX) is 156, where 100 represents the national average. This area is above the national average. Median home value: $460,000.
What schools serve zip code 78681?
Zip code 78681 in Round Rock, Texas is served by the local school district of Williamson County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.