San Marcos, CA zip codes
San Marcos, California has 4 zip codes (3 residential, 1 PO box or single-organization). Most of it is in San Diego County. Together these zip codes are home to about 101K people.
Zip codes
4
Population
101K
All zips combined
Largest zip
92078
53,605 residents
Income range
$97K–$120K
Median by zip