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.


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.


GIS Interactive Maps will be down for scheduled maintenance on the 1st Wednesday of each month from 2pm to 5pm. There is also a possibility of downtime from 5pm to 6pm every Wednesday for additional ad-hoc maintenance. Users will still have access to .pdf maps and zipped shapefiles. We apologize for any inconvenience.

GIS Data

GIS data is available in the form of downloadable zipped shapefiles. If you need data that is not available for download, please submit a Public Information Request. The requested information will be sent no later than 10 business days.

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.