Geocachers of the Bay Area Home         Collage images except poppies © Lynn Murphy  

California Counties

San Mateo County

Official county website

GSAK Polygon: San Mateo polygon
Benchmark .zip file:
Benchmark BMGPX file: ca081.gpx
Oldest cache: GCD2 and GCD6
Confluence Points:
DeLorme Polygons:

City and other polygons:

Other resources:

Convention and Visitors Bureau

County Parks Foundation

History museum and sites