Sign up for Medicare by county in California
Choose the county you live in to find city and ZIP pages with local Medicare enrollment guidance.
All counties in California
- Los Angeles County (133 cities)
- San Bernardino County (71 cities)
- San Diego County (52 cities)
- Riverside County (43 cities)
- Fresno County (36 cities)
- Sonoma County (36 cities)
- Kern County (35 cities)
- Contra Costa County (30 cities)
- Mendocino County (28 cities)
- Marin County (26 cities)
- Placer County (26 cities)
- Monterey County (25 cities)
- Sacramento County (24 cities)
- Shasta County (24 cities)
- El Dorado County (23 cities)
- San Mateo County (22 cities)
- Santa Clara County (21 cities)
- Siskiyou County (21 cities)
- Calaveras County (19 cities)
- San Luis Obispo County (19 cities)
- Merced County (18 cities)
- Stanislaus County (18 cities)
- Plumas County (17 cities)
- Lassen County (16 cities)
- San Joaquin County (16 cities)
- Imperial County (15 cities)
- Santa Barbara County (14 cities)
- Tehama County (14 cities)
- Amador County (13 cities)
- Madera County (11 cities)
- Inyo County (10 cities)
- Modoc County (10 cities)
- Solano County (10 cities)
- Napa County (9 cities)
- Glenn County (8 cities)
- Mariposa County (8 cities)
- Mono County (8 cities)
- Sutter County (8 cities)
- Colusa County (6 cities)
- Del Norte County (5 cities)
- San Benito County (4 cities)
- Alpine County (3 cities)
- Alameda County (2 cities)
- San Francisco County (1 cities)
Common questions
Straight answers to the questions people ask most when they're trying to enroll in California.
Is this site affiliated with Medicare.gov or Social Security?
No. This site provides educational Medicare information and points you to official resources. We don’t offer plan recommendations.
Where do I sign up for Medicare Part A and Part B?
In most cases, you enroll in Part A and Part B through Social Security. If you’re still working or have employer coverage, the timing can be different.
When should I sign up to avoid penalties?
Timing depends on your situation (turning 65, disability, employer coverage, and more). When in doubt, start planning a few months before you want coverage to begin.
What information should I have ready?
Common items include your Social Security number and details about current coverage if you’re enrolling due to a special situation. Save any confirmation numbers or letters after you submit.