Welcome to the District 3 Website for Supervisor Don Horsley

I am so proud to be the Supervisor representing San Mateo County's Third District. All of San Mateo County is a jewel among California's counties, but the Third District is an especially unique area. Our gorgeous coast, from Pacifica to the Santa Cruz County line, is a world-class scenic environment.

There are obvious challenges facing San Mateo County, but we must not lose sight of the fact that we live in a remarkable area with tremendous resources. The negatives do not outweigh the positives in this county. Certainly our budget dilemmas must be addressed, local social safety nets must be protected and a clear-eyed view of the path forward must be followed. I know that our communities are diverse, vibrant and have enthusiasm for the future. It is my sincere goal to bring an equally enthusiastic approach to my role in county government.

Please feel free to contact me at dhorsley@smcgov.org or call my office at 650-363-4569 if I can be of service to you.

Don Horsley

*Don Horsley was Elected to the Board of Supervisors for a third term in June 2018. That term expires December 31, 2022.

Connect the Coastside Virtual Conversations

You’re invited to join a series of virtual conversations hosted by the County of San Mateo to learn about the Connect the Coastside plan and share your ideas to shape the future of transportation on the Midcoast. Hear recommendations to improve walking, biking, taking transit and driving on the Midcoast and participate in small group discussions to share your experience and ideas.

There are several opportunities to join the conversation:

Connect the Coastside Overview Meeting
Saturday May 30th, 10:30 AM - 12:00 PM
Register Here: https://bit.ly/CTCMay30

Montara & Moss Beach Focused Meeting
Monday June 15th, 6:30 PM - 8:00 PM
Register Here: https://bit.ly/CTCJune15

Princeton, El Granada, & Miramar Focused Meeting
Thursday June 25th, 6:30 PM - 8:00 PM
Register Here: https://bit.ly/CTCJune25 

Learn more about programs and services funded by Measure K.

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