Tool

ZIP Codes Within a Radius

Enter a ZIP code and a distance. The tool lists every residential ZIP code whose center (the Census Bureau's internal point of its area) lies within that many miles, nearest first. PO Box and single-organization codes have no area of their own, so they are not placed.

No other ZIP code within 10 miles of 78666

Try a wider circle: 15 miles.

ZIP 78130ZIP 78132ZIP 78610ZIP 78622ZIP 78623ZIP 78640ZIP 78655ZIP 78656ZIP 78661ZIP 78670ZIP 7867678666 · San Marcos · 0.0 mi78666ZIP 78130ZIP 78132ZIP 78610ZIP 78622ZIP 78623ZIP 78640ZIP 78655ZIP 78656ZIP 78661ZIP 78670ZIP 7867678666 · San Marcos · 0.0 mi78666ZIP 78130ZIP 78132ZIP 78610ZIP 78622ZIP 78623ZIP 78640ZIP 78655ZIP 78656ZIP 78661ZIP 78670ZIP 7867678666 · San Marcos · 0.0 mi78666
The 10-mile circle around 78666's center; residential ZIP codes centered inside it, shaded by median household income in national fifths (ACS 2020-2024); the others are outlined. <$54k$98k+no figureZIP codes centered outside the circle
Distance between internal points, in miles
ZIPTownPeopleMiles
78666San Marcos, TX88,5830.0

Source: U.S. Census Bureau, 2023 Gazetteer internal points (2020 ZCTAs); GeoNames postal codes (CC BY 4.0) for a PO Box origin's town. Straight-line distance, not driving distance.