27 ZIP Code Tabulation Areas in Williamson County, Texas. The population-weighted median household income is about $113,433, the median home value about $467,345, and 64.3% of occupied homes are owner-occupied.
- 27
- ZIP codes
- 856.5K
- Population
- 53
- Data points
Williamson County at a glance
- $113,433
- Median household income
- $467,345
- Median home value
- 38.1
- Median age
- 64.3%
- Owner-occupied
- 346,759
- Housing units
Income, home value, and age are population-weighted averages of the ZIP-level medians in the file. Counts are exact.
Top 5 Williamson County ZIP codes by median household income| # | ZIP | City | Population | Homeowner % | Median HH $ |
|---|
| 1 | 78717 | Austin | 37,262 | 51.3% | $145,325 |
| 2 | 78681 | Austin | 56,691 | 73.9% | $137,819 |
| 3 | 78641 | Cedar Park | 99,865 | 77.2% | $135,024 |
| 4 | 78642 | Liberty Hill | 26,434 | 82.9% | $132,958 |
| 5 | 78628 | Georgetown | 50,822 | 75.5% | $125,635 |
Top 5 Williamson County ZIP codes by population| # | ZIP | City | Population | Homeowner % | Median HH $ |
|---|
| 1 | 78641 | Cedar Park | 99,865 | 77.2% | $135,024 |
| 2 | 78613 | Austin | 89,956 | 63.9% | $125,487 |
| 3 | 78665 | Round Rock | 66,171 | 61.4% | $122,680 |
| 4 | 78664 | Pflugerville | 62,060 | 53.7% | $87,417 |
| 5 | 78681 | Austin | 56,691 | 73.9% | $137,819 |
Top 5 Williamson County ZIP codes by Homeowner GDP| # | ZIP | City | Population | Homeowner % | Median HH $ | Homeowner GDP |
|---|
| 1 | 78641 | Cedar Park | 99,865 | 77.2% | $135,024 | $3.7B |
| 2 | 78613 | Austin | 89,956 | 63.9% | $125,487 | $2.7B |
| 3 | 78681 | Austin | 56,691 | 73.9% | $137,819 | $2B |
| 4 | 78665 | Round Rock | 66,171 | 61.4% | $122,680 | $1.8B |
| 5 | 78628 | Georgetown | 50,822 | 75.5% | $125,635 | $1.8B |
Homeowner GDP = owner-occupied units × median household income — a proxy for aggregate homeowner spending power in a ZIP, useful for scoring market opportunity. Not an official economic statistic.
Densest: 78727 (Austin) at 3,856 people/sq mi. Least dense: 76577 (Thorndale) at 22 people/sq mi.
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