North American Numbers Source-cited · ownership disclosed
Area code
350
In service
United States · since 2022

Stockton (overlay)

Area code 350 is an all-services overlay of area code 209, serving the northern San Joaquin Valley and Sierra foothills. Assigned in 2022 to relieve central office code exhaustion (re-check against NANPA).

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Stockton (overlay)
Type
geographic
Status
in service
In service since
2022
Projected exhaust
2056 Q1

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 350 is

Northern San Joaquin Valley and Sierra Foothills across ten counties (identical footprint to 209)..

Communities served wholly or partly by 350:

StocktonModestoMercedTracyManteca

Identical service area to 209.

B · Relationships

How it relates to other codes

The codes 350 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2022 209 Stockton 350 overlays the same geography as parent code 209.
What's changing. Overlay of 209; ten-digit dialing already in effect. Wikipedia date is the assignment date; re-check NANPA for activation.
C · History

How 350 got here

2022-11-28
Area code 350 assigned as an all-services overlay of 209 to address impending exhaustion; ten-digit dialing already in effect (re-check against NANPA).
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
101
Prefixes available
699
Thousands-blocks assigned
645

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 350 with another code →
Sources
Wikipedia ↗
Area codes 209 and 350
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.