How do I find a ZIP code by city or state?

You can find ZIP codes by city or state using our search tool. Just enter the city or state name, and you'll see all related ZIP codes instantly.

What is a ZIP+4 code?

A ZIP+4 code adds four digits to the basic five-digit ZIP code. It helps the USPS deliver mail more precisely to specific addresses or buildings.

Are ZIP codes the same as postal codes?

ZIP codes are the U.S. version of postal codes, used by the USPS to identify delivery areas. Other countries use postal codes with different formats.

All ZIP Codes for San Marcos Texas – Postal Code Lookup

San Marcos ZIP Code

The city of San Marcos is assigned specific ZIP Code(s) by the United States Postal Service (USPS) to make mail delivery accurate and efficient. A ZIP Code in San Marcos helps identify the correct postal area, ensuring that letters, parcels, and packages reach the right neighborhood or post office without delay. For residents, businesses, and visitors, knowing the correct San Marcos ZIP Code is important not only for mailing purposes but also for location-based services, navigation, and demographic reference.

San Marcos

Post Office	San Marcos
Division	Hays
Pincode	78666

San Marcos

Post Office	San Marcos
Division	Hays
Pincode	78667

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Zip Codes in San Marcos, Texas

Zip Code list in Hays for your selected city San Marcos is shown below. Use these ZIP Codes to ensure accurate mail delivery, business operations, or location reference.

78666

78667

About San Marcos, Texas ZIP Codes

San Marcos is located in Hays County, Texas. The United States Postal Service (USPS) assigns multiple ZIP Codes in this region to simplify mail distribution, navigation, and address identification. Each ZIP Code in San Marcos covers a specific neighborhood or area, which is important for residents, businesses, and government offices. Having the correct ZIP Code ensures smooth delivery of letters, online orders, and official documents.

Why Knowing the ZIP Code is Important?

Ensures accurate and timely mail delivery
Helps businesses and eCommerce platforms verify addresses
Useful for demographic research and census data
Required for utilities, banking, and government services

Frequently Asked Questions (FAQs) about San Marcos ZIP Codes

The primary ZIP Code for San Marcos, Texas depends on the specific neighborhood. Use our list above to find the correct code.

San Marcos has multiple ZIP Codes covering different areas of the city. Check the table above for the complete list.

You can use our ZIP Code lookup tool by selecting the city, county, and state to locate the right code for your address.

All ZIP Codes in San Marcos are assigned and managed by the United States Postal Service (USPS) for accurate mail sorting and delivery.

Yes, in many cases a single ZIP Code can cover more than one neighborhood or locality in San Marcos to simplify mail distribution.

ZIP Codes usually remain stable for decades, but USPS may introduce new codes or adjust boundaries when population grows or new delivery routes are added in San Marcos.