94403 is zip code located in San Mateo, California. The population is 39,311, making 94403 the largest zipcode in San Mateo and the 7th largest in San Mateo County.
There are 9 public schools in 94403 with an average Homefacts rating of B+. The total crime rate for San Mateo is moderate , and there are 16 registered sex offenders residing in the zip code 94403. Unemployment in 94403 is low.