| City: | Round Rock, Texas |
| County: | Williamson County |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 9:51:19 AM |
| Population: | No Population Data |
| Area Code: | 512 |
| Classification: | PO Box |
| Coordinates: | 30.5102, -97.7067 |
| Quick Link: |
ZIP code 78683 isn't a neighborhood or town. It's a PO Box ZIP that serves Round Rock, Texas, one of the fastest-growing cities in the Austin metro area. With zero residential population and no geographic territory of its own, this ZIP exists entirely within the boundaries of 78664.
The post office at this location maintains 549 PO Boxes and handles mail for 444 businesses. All 149 street delivery records point to a single address: Double Creek Drive, with unit designators. This pattern indicates a commercial mail receiving facility rather than a residential post office. Businesses in the area use this ZIP for their mailing addresses while receiving physical mail through the unit-based system.
Round Rock residents don't live in 78683. They receive street delivery through neighboring ZIP codes like 78664, 78665, or 78681. This PO Box ZIP serves a specific business function in a commercial corridor. Nearby business parks include Interchange Business Park and Gattis Scholl Business Park.
If you're mailing to a Round Rock business with a 78683 address, you're sending to a PO Box or a unit at the Double Creek Drive facility. The ZIP code has existed since before 2004, providing decades of commercial mail service to this growing Texas community.
Single street with unit-based addressing suggests a commercial mail receiving facility.
ZIP Code 78683 supports both business and residential activity. According to the Business Census (2024), there are 27 business establishments, employing about 267 people with an annual payroll of $9,243,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 974Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 27Source: CBP |
| 1st Quarter Payroll: | $2,361,000Source: CBP |
| Annual Payroll: | $9,243,000Source: CBP |
| # of Employees: | 267Source: CBP |
ZIP Code 78683 is located in Williamson County, Texas, within the Austin-Round Rock-San Marcos, TX Metropolitan Statistical Area (CBSA 12420) and Texas's 17th Congressional District. This Metro area has a population of 1,716,289 people, about 0.00% of whom live in ZIP Code 78683. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Austin-Round Rock-San Marcos, TXSource: Census |
| CBSA Number: | 12420Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 1,716,289Source: Census |
| MSA: | Austin-San Marcos, TX MSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 17Source: USPS |
| Congressional Land Area: | 7651.16 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 4863500Source: Census |
| Place Name: | Round Rock city; TexasSource: Census |
We could not locate which school district 78683 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.