95203 ZIP Code: Stockton, California
ZIP code 95203 covers Stockton, California. It sits in San Joaquin County. Stockton is covered by 20 ZIP codes in total, so 95203 is one delivery area within it rather than the whole city. A ZIP code is a US Postal Service mail route, not a boundary on a map, so it describes where post is delivered rather than an administrative area.
| ZIP code | 95203 |
|---|---|
| Place | Stockton |
| State | California (CA) |
| County or equivalent | San Joaquin County |
| ZIP codes covering Stockton | 20 |
| Phone area codes in California | 37 |
| Country | United States |
Phone area codes in California
ZIP codes and area codes are separate systems drawn for different purposes, so no ZIP code maps to exactly one area code. These are every geographic code used across California.
ZIP codes near 95203
- 95296 Stocktonabout 1 mile
- 95201 Stocktonabout 1 mile
- 95202 Stocktonabout 1 mile
- 95204 Stocktonabout 1 mile
- 95211 Stocktonabout 2 miles
- 95206 Stocktonabout 2 miles
- 95205 Stocktonabout 3 miles
- 95267 Stocktonabout 3 miles
Distances are straight-line, between the approximate centres of each delivery area.
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Frequently asked questions
Where is ZIP code 95203?
ZIP code 95203 is in Stockton, California, in San Joaquin County. ZIP codes are mail delivery routes rather than mapped regions, so the code identifies a set of addresses the Postal Service serves together, not a district with fixed borders.
What county is 95203 in?
95203 is in San Joaquin County, California. A single ZIP code can straddle a county line, because mail routes were drawn for delivery efficiency and take no notice of county boundaries, so the county shown is the one the code is primarily associated with.
What area code goes with ZIP code 95203?
ZIP codes and telephone area codes are separate systems with different boundaries, so no ZIP code maps to exactly one area code. California uses 37 geographic area codes: 209, 213, 279, 310, 323, 341, 369, 408, 415, 424, 442, 510, 530, 559, 562, 619, 626, 627, 628, 650, 657, 661, 669, 707, 714, 747, 760, 805, 818, 820, 831, 858, 909, 916, 925, 949 and 951.
How many ZIP codes does Stockton have?
Stockton, California has 20 ZIP codes in this dataset, of which 95203 is one. Large cities are split across many codes so mail can be sorted by district, and the codes are usually numerically close to each other.
Is 95203 a real ZIP code?
Yes. 95203 appears in the GeoNames postal-code dataset as an active US code assigned to Stockton, California. Codes that have been retired or never issued do not appear, which is why entering one on this site returns a not-found page rather than a blank record.
Why do ZIP code boundaries look odd on maps?
Because they are not boundaries. A ZIP code is a collection of mail routes, and a route is a line a carrier walks or drives, not an area. Any ZIP code map you have seen is somebody's approximation drawn around the addresses in a code, which is also why two ZIP code maps rarely agree with each other.
Can two addresses in the same ZIP code be in different cities?
Yes, routinely. The Postal Service assigns a preferred city name to each code for addressing purposes, and that name often covers several neighbouring towns, unincorporated areas or a whole postal district. The place shown here is the one the source names for the code, not a claim that every address in it is inside that town's limits.
ZIP code, place, county and location data from GeoNames, used under CC BY 4.0, extracted 2026-08-22. ZIP codes are Postal Service delivery routes, not administrative areas, so a code can cross city and county lines and the place name shown is the one the source records for the code. Coordinates are an approximate centre of the delivery area, not a precise location. Population and time zone are not shown because the source does not publish them.