Find the last 4 digits (ZIP+4) for an address in 94521

ZIP 94521, Concord, CA is filled in. Just type the street address.

Addresses are checked through our secure proxy. Bot checks use Cloudflare Turnstile. Each device can run 5 live checks per day; repeats of the same address are free.

ZIP Code 94521 – Concord, CA

Concord, California · Contra Costa County · Pacific time

ZIP code94521
CityConcord
StateCalifornia
CountyContra Costa County
Population41,909
Time zonePacific · local time
ZIP typeStandard (has a Census ZCTA area)
Land area9.68 sq mi
Center (lat, long)37.9529, -121.9697

Area codes in this area

925

These are the area codes that most often serve ZIP 94521 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

94527 Concord · 0.6 mi94518 Concord · 2.9 mi94519 Concord · 3.4 mi94598 Walnut Creek · 3.5 mi94522 Concord · 3.8 mi94524 Concord · 3.8 mi94529 Concord · 3.8 mi94565 Pittsburg · 4.5 mi

About ZIP 94521

ZIP code 94521 is assigned to Concord, California. It lies in Contra Costa County. Its Census area covers about 9.68 square miles of land. The closest neighboring ZIP is 94527 (Concord), about 0.6 miles away.

Every address in 94521 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources