| City: | El Sobrante, California |
| City Alias: | Richmond |
| County: | Contra Costa County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 9:53:46 AM |
| Population: | No Population Data |
| Area Codes: | 341 / 510 |
| Classification: | PO Box |
| Coordinates: | 37.9772, -122.2943 |
| Quick Link: |
ZIP code 94820 serves a single multi-unit complex on Appian Way in the El Sobrante area of Richmond, California. This ZIP was established before October 2004 and operates as a postal branch facility within Contra Costa County. The facility maintains 483 PO Boxes and handles delivery to 151 business addresses, all located at the same street address with individual unit designators.
This isn't a geographic territory. ZIP 94820 functions as a point location enclosed within the larger 94803 ZIP code. Mail addressed to 94820 goes to the Appian Way complex, where residents and businesses use either PO Boxes or building-specific street addresses with unit numbers. Both El Sobrante and Richmond are accepted city names for mailing purposes, though El Sobrante is the preferred designation.
The concentrated nature of this ZIP reflects a common pattern in the San Francisco Bay Area, where large residential or mixed-use developments sometimes receive dedicated postal facilities. Nearby neighborhoods include May Valley, Hilltop Green, and El Sobrante Hills, all within the Richmond city limits.
All delivery occurs at a single address on Appian Way with individual unit numbers.
ZIP Code 94820 supports both business and residential activity. According to the Business Census (2024), there are 3 business establishments, employing about 4 people with an annual payroll of $153,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 623Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 3Source: CBP |
| 1st Quarter Payroll: | $25,000Source: CBP |
| Annual Payroll: | $153,000Source: CBP |
| # of Employees: | 4Source: CBP |
ZIP Code 94820 is located in Contra Costa County, California, within the San Francisco-Oakland-Fremont, CA Metropolitan Statistical Area (CBSA 41860) and California's 8th Congressional District. This Metro area has a population of 4,335,391 people, about 0.00% of whom live in ZIP Code 94820, and is subdivided into the Oakland-Fremont-Berkeley, CA division. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | San Francisco-Oakland-Fremont, CASource: Census |
| CBSA Number: | 41860Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | Oakland-Fremont-Berkeley, CA (CBSA Div 36084)Source: Census |
| CBSA Population: | 4,335,391Source: Census |
| MSA: | San Francisco-Oakland-San Jose, CA CMSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 08Source: USPS |
| Congressional Land Area: | 32867.21 sq miSource: Census |
| PMSA: | Oakland, CA PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0622454Source: Census |
| Place Name: | El Sobrante CDP (Contra Costa County); CaliforniaSource: Census |
We could not locate which school district 94820 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.