Round Rock Texas ZIP Codes

Round Rock holds 6 ZIP codes, all inside one county and one postal prefix.

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Round Rock codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Round Rock. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

Every Round Rock ZIP code begins 786. Those first three digits identify the sectional center facility that processes mail for this part of Texas. Statewide that range covers 75 ZIP codes, so Round Rock accounts for 8% of it.

Every Texas ZIP prefix and the region it covers →

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Round Rock occupies.

• 512 Area code 512
• 737 Area code 737

Round Rock Texas area codes in full →

Straight-line distance between place reference points, not driving distance.