ZIP codes

ZIP codes in Hays County, Texas

Hays County has 13 ZIP codes. 1 lie entirely inside it and 12 are shared with neighboring counties, so part of their land and their people are elsewhere. About 265,524 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 13; 1 more just touches the border (under 1% of their land)
Entirely inside: 1; 99% or more of their land
Shared with other counties: 12; Most with Travis County (8)
Most populated ZIP: 78666; 88,583 people · San Marcos
Least populated ZIP: 78619; 6,693 people · Driftwood
Largest ZIP by land: 78666; 192 sq mi · San Marcos

Map of the ZIP codes in Hays County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Hays County

13 ZIP codes in Hays County, TX, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
78610	Buda	48,319	71%	≈ 44,773
78619	Driftwood	6,693	100%	6,693
78620	Dripping Springs	22,860	85%	≈ 19,014
78623	Canyon Lake	1,645	7.8%	≈ 90
78640	Kyle	77,531	84%	≈ 76,486
78652	Austin	5,287	44%	≈ 680
78656	San Marcos	2,847	3.0%	≈ 624
78663	Round Mountain	503	2.0%	≈ 42
78666	San Marcos	88,583	78%	≈ 81,578
78676	Wimberley	15,822	92%	≈ 15,412
78736	Austin	9,651	3.3%	≈ 253
78737	Belterra	27,023	71%	≈ 19,327
78739	Austin	20,659	7.8%	≈ 352

They also touch the county with under 1% of their land, so they aren’t counted: 78130.

ZIP codes shared with other counties

These 12 ZIP codes have part of their land in another county. The first figure is the share of their land in Hays County; then, where the rest lies.

78610 (Buda): 71% here; 26% in Travis County and 2.4% in Caldwell County.
78620 (Dripping Springs): 85% here; 9.6% in Travis County and 5.0% in Blanco County.
78623 (Canyon Lake): 7.8% here; 92% in Comal County.
78640 (Kyle): 84% here; 15% in Caldwell County and 1.4% in Travis County.
78652 (Austin): 44% here; 56% in Travis County.
78656 (San Marcos): 3.0% here; 97% in Caldwell County.
78663 (Round Mountain): 2.0% here; 93% in Blanco County and 3.8% in Travis County.
78666 (San Marcos): 78% here; 16% in Guadalupe County, 4.3% in Comal County, and 2.0% in Caldwell County.
78676 (Wimberley): 92% here; 6.6% in Blanco County.
78736 (Austin): 3.3% here; 97% in Travis County.
78737 (Belterra): 71% here; 29% in Travis County.
78739 (Austin): 7.8% here; 92% in Travis County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Austin (3), San Marcos (2), Belterra (1), Buda (1), Canyon Lake (1), and Driftwood (1); 10 places in all.

They start with 2 different three-digit prefixes, one per USPS sorting center: 786 and 787.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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