San Mateo County, CA isn't checked yet
We haven't checked police, fire and EMS here yet, so we can't tell you which scanner works.
Cities in this county
San Mateo · Belmont · Hillsborough · Pacifica · Menlo Park · Redwood City · Daly City · San Bruno · Foster City · Burlingame · East Palo Alto · Brisbane · San Carlos · Millbrae · Atherton · Woodside · Portola Valley · Colma · Broadmoor · La Honda
Until then, four questions will help you choose:
Don't buy the wrong scanner