94528 ZIP Code

Questions about 94528

What city is ZIP code 94528 in?+

94528 is associated with Diablo, California in the bundled dataset. ZIP areas can cross city and county lines, so use the city and county fields together.

What county is 94528 in?+

Contra Costa. County boundaries and postal areas are not the same thing; a ZIP can serve addresses in more than one county.

What timezone is 94528 in?+

America/Los_Angeles. This is the IANA timezone name for the city associated with the ZIP.

Is 94528 a real ZIP code?+

It appears in the public city dataset bundled with this site. That confirms the format and city association, not that a specific street, mailbox, or resident exists.