North American Numbers Source-cited · ownership disclosed
Area code
209
In service
United States · since 1958

Stockton

Area code 209 serves the northern San Joaquin Valley and Sierra foothills, including Stockton, Modesto, and Merced. It split from area code 916 in 1958 and is overlaid by area code 350.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Stockton
Type
geographic
Status
in service
In service since
1958
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 209 is

Northern San Joaquin Valley and Sierra Foothills across ten counties: Alpine, Amador, Calaveras, El Dorado, Mariposa, Merced, Sacramento, San Joaquin, Stanislaus, and Tuolumne..

Communities served wholly or partly by 209:

StocktonModestoMercedTracyManteca

Representative list of major cities, not exhaustive.

B · Relationships

How it relates to other codes

The codes 209 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?

Split from · 1958 916 Sacramento 209 was created in 1958 by an area code split of 916.
Overlay · 2022 350 Stockton (overlay) All-services overlay of 209 (assigned November 28, 2022); re-check against NANPA.
Spawned · 1998 559 Fresno 559 split from 209 on November 14, 1998 for the central San Joaquin Valley.
What's changing. Overlaid by area code 350; ten-digit dialing in effect since October 24, 2021.
C · History

How 209 got here

1958
Area code 209 established via a split of area code 916, covering the southern portion.
Source: Wikipedia
1998-11-14
Southern/central portion split off as area code 559.
Source: Wikipedia
2021-10-24
Ten-digit dialing took effect ahead of overlay, prompted by the 988 lifeline conflict.
Source: Wikipedia
2022-11-28
Overlay area code 350 assigned to address central office code exhaustion.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
800
Prefixes available
0
Thousands-blocks assigned
4,435

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

Compare 209 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.