ZIP 78664 (Round Rock, TX): income and new businesses
Updated 2026-10-15. Sources: IRS Statistics of Income ZIP code data and Texas Comptroller sales-tax permits.
In tax year 2022, residents of ZIP 78664 filed 27,970 federal returns covering about 51,270 people. Average adjusted gross income was $79,234 per return, 13% above the typical Texas ZIP ($69,978). That ranks #575 of 1,616 Texas ZIP codes.
From 2021 to 2022, average income per return rose 3.7% and the number of returns grew 1.0%.
21% of returns reported self-employment or small-business income (Schedule C), lower than the Texas rate of 24%. 14% claimed the Earned Income Tax Credit (state: 19%).
Since October 2025 the Texas Comptroller has issued 411 new sales-tax permits to business locations in 78664, about 14.7 per 1,000 returns, 1.1x the Texas average of 13.0. That is up 37% on the 12 months before.
Income brackets in 78664
| Adjusted gross income | Returns | Share |
|---|---|---|
| $1 to $25k | 6,600 | 24% |
| $25k to $50k | 7,230 | 26% |
| $50k to $75k | 4,870 | 17% |
| $75k to $100k | 2,780 | 10% |
| $100k to $200k | 4,550 | 16% |
| $200k and up | 1,940 | 7% |
Tax return facts
| Measure | 78664 |
|---|---|
| Total adjusted gross income | $2,216,171,000 |
| Returns with wages | 24,350 (avg $74,033) |
| Returns with business income | 5,770 |
| Returns with dividends | 4,510 |
| Returns with retirement/pension income | 3,530 |
| Returns with unemployment pay | 550 |
| Earned Income Tax Credit claims | 3,990 ($9,614,000 total) |
New businesses by sector (since Oct 2025)
| Sector | New permits |
|---|---|
| Retail | 150 |
| Food & lodging | 52 |
| Other services (repair, personal care) | 41 |
| Construction | 25 |
| Manufacturing | 25 |
| Professional services | 24 |
Most common new business types
| Business type (NAICS) | Code | New permits |
|---|---|---|
| Electronic Shopping and Mail-Order Houses | 454110 | 54 |
| Mobile Food Services | 722330 | 14 |
| All Other Miscellaneous Store Retailers (except Tobacco Stores) | 453998 | 13 |
| Full-Service Restaurants | 722511 | 12 |
| Limited-Service Restaurants | 722513 | 10 |
| Beauty Salons | 812112 | 9 |
| Cosmetics, Beauty Supplies, and Perfume Stores | 446120 | 9 |
| Hobby, Toy, and Game Stores | 451120 | 8 |
Monthly new permits
| Month | Permits | |
|---|---|---|
| Oct 2025 | 31 | |
| Nov 2025 | 28 | |
| Dec 2025 | 27 | |
| Jan 2026 | 27 | |
| Feb 2026 | 35 | |
| Mar 2026 | 33 | |
| Apr 2026 | 43 | |
| May 2026 | 30 | |
| Jun 2026 | 35 | |
| Jul 2026 | 35 | |
| Aug 2026 | 39 | |
| Sep 2026 | 37 |
How 78664 compares
| Measure | 78664 | Area (786xx, 15 ZIPs) | Texas |
|---|---|---|---|
| Avg income per return | $79,234 | $101,584 | $69,978 (typical ZIP) |
| New permits per 1,000 returns | 14.7 | 14.4 | 13.0 |
| Self-employment share | 21% | 20% | 24% |
Local business takeaways
- Construction makes up 8% of new permits here, 2.7x its share across these 300 ZIPs.
- Professional services makes up 8% of new permits here, 1.5x its share across these 300 ZIPs.
- The busiest month for new permits was Apr 2026 with 43.
- 7% of returns report $200k or more, a mixed-income area.
What this means
- Budgeting: the average return here works out to about $6,603 a month before tax. Try it in the 50/30/20 budget calculator.
- Selling to local businesses: 411 new locations opened in about a year, led by retail. The Texas new business list tool gives you the names and addresses, updated daily.
- Comparing areas: pull the same IRS numbers for any US ZIP with the ZIP income tool.
Nearby ZIP codes
| ZIP | Avg income per return | New permits |
|---|---|---|
| 78665 (Round Rock, TX) | $107,260 | 380 |
| 78666 (San Marcos, TX) | $65,196 | 498 |
| 78660 (Pflugerville, TX) | $87,252 | 707 |
| 78653 (Manor, TX) | $71,647 | 266 |
| 78681 (Round Rock, TX) | $131,950 | 314 |
| 78641 (Leander, TX) | $136,395 | 773 |
Notes on the data
IRS figures are for tax year 2022, the latest ZIP-level release, and count returns filed from addresses in the ZIP, not households. Adjusted gross income is income before the standard deduction. IRS rounds counts and leaves out very small groups. Permit counts include only locations still holding an active permit, so businesses that already closed are not counted. Permits cover businesses that sell taxable goods or services.
Get the full data
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Data from the IRS Statistics of Income program and the Texas Comptroller of Public Accounts. Figures are rounded by the source; check the original before relying on them. Not financial advice. Numbers are illustrative; your lender's statements control.