The City of San Marcos provides geographic data in the form of interactive maps, PDFs, and downloadable shapefiles. Interactive maps allow public access to Geographic Information System (GIS) data in a user-friendly environment, which can be used with little or no training. Additionally, users can download static (paper) maps in PDF format and GIS data layers in shapefile format.

Click here to access All GIS & Open Data

 Looking for data?

1. GIS Data Downloads

These downloads require the use of a GIS data viewer. ESRI provides a free viewer, ArcExplorer, available for download. Some of the features are very large and may take several minutes to download. All files are NAD 83 State Plane Texas South Central.

2. Public Information Request

If you are not able to find what you are looking for on the GIS Data Downloads page, please submit a Public Information Request. The requested information will be sent no later than 10 business days.

NOTE: All utility data requests, including water, wastewater, electric, and stormwater data, must go through the Public Information Request process.

 Maintenance Schedule

GIS Interactive Maps will be down for scheduled maintenance on the 1st Wednesday of each month from 11 a.m. to  2 p.m. There is also a possibility of downtime from 4 p.m. to 6 p.m. every Wednesday for additional ad-hoc maintenance. Users will still have access to .pdf maps and zipped shapefiles. We apologize for any inconvenience.


This web page is a public resource of general information. The City of San Marcos makes no warranty, representation, or guarantee as to the content, accuracy, timeliness or completeness of any of the spatial data or database information provided herein. The City of San Marcos shall assume no liability for any errors, omissions, or inaccuracies in the information provided regardless of how caused, or any decision made or action taken or not taken by any person relying on any information or data furnished within. Use of this data indicates a user’s unconditional acceptance of all risks.