Area Code 350
California
Area code 350 serves California, primarily Stockton, in the Pacific Time (PT) time zone. It is an overlay area code sharing territory with area code 209.
Overlay Area Code
This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.
This area code shares its geographic region with: area code 209 (Stockton).
In service since: 28-Nov-2022
Demographics & Economics
- Total Population
- 2,163,410
- Population Density
- 159 people/sq miabove U.S. average (U.S.: 93 people/sq mi)
- Median Household Income
- $79,877near U.S. median (U.S.: $75,144)
- Poverty Rate
- 13.5%above U.S. average (U.S.: 11.5%)
- Unemployment Rate
- 7.9%above U.S. average (U.S.: 3.6%)
- Education Attainment
- Bachelor's Degree+21.5%below U.S. average (U.S.: 33.7%)High School or Lower38.7%
Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.
See how this area code compares to all US area codes in the Statistics dashboard.
Time Zone
- Pacific Time (PT)
NANPA Relief Status
According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.
Source: NANPA NPA Relief Planning Reports · See all relief planning statuses
Current Time
Prefix Utilization
Geographic Coverage
State
CA
Major Cities
- Stockton
- Modesto
- Tracy
- Merced
- Manteca
- Turlock
- Lodi
- Lincoln
- Ceres
- Los Banos
- Lathrop
- Atwater
- Galt
- Mountain House
- Riverbank
- Patterson
- Oakdale
- Ripon
- Salida
- Livingston
- Newman
- Winton
- Delhi
- Garden Acres
and 143 more cities
Historical Timeline of Area Code 350
Area code 350 was activated on November 28, 2022, as an all-services overlay of area code 209 in California's northern San Joaquin Valley. CPUC Decision 22-05-018 approved the overlay on May 19, 2022, with an expedited 6-month implementation. (Source: CPUC)
Key milestones:
- 1947: 415 area code created as one of the original California area codes in the NANP.
- 1958: Area code 209 created by splitting from 415. (Source: Wikipedia)
- 1997: Area code 559 split from 209, serving the southern San Joaquin Valley including Fresno.
- 2021: 209 transitioned to mandatory 10-digit dialing on October 14, 2021, due to FCC's designation of 988 for the National Suicide Prevention Lifeline.
- May 2022: CPUC Decision 22-05-018 approved 350 as an all-services overlay for 209 (Docket A.21-04-007). (Source: CPUC Decision)
- June 2022: NANPA Planning Letter PL-594 issued for 350 overlay implementation. (Source: NANPA PL-594)
- July 2022: Mandatory 1+10-digit dialing enforcement deadline for carriers.
- November 28, 2022: 350 area code activated, overlaid onto 209.
Area code 350 covers the same northern San Joaquin Valley region as 209, including Stockton, Modesto, Merced, and surrounding communities. The overlay did not require changes to existing 209 numbers; new assignments may receive 350 prefixes.
Regulatory History
Area code 350 was authorized through CPUC Docket A.21-04-007, resulting in Decision 22-05-018 on May 19, 2022. NANPA formalized the overlay through Planning Letter PL-594 on June 6, 2022, with mandatory 1+10-digit dialing enforcement by July 15, 2022, and in-service date of November 28, 2022. (Source: CPUC Decision)
| Docket / Document | Date | Outcome |
|---|---|---|
| FCC 988 designation (NANPA PL-556) | January 8, 2021 | Required 209 to transition to 10-digit dialing by October 24, 2021, due to 988 Suicide and Crisis Lifeline conflict |
| CPUC Docket A.21-04-007 | May 19, 2022 | Decision 22-05-018 approved all-services overlay of 350 onto 209 NPA; expedited implementation to 6 months; required PEP with no paid advertising. (Source: CPUC) |
| NANPA PL-594 | June 6, 2022 | Formalized 350 overlay of 209; set mandatory 1+10-digit dialing enforcement deadline of July 15, 2022; in-service date November 28, 2022; test number 350-350-1350. (Source: NANPA PL-594) |
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 350).
| County | Population | Share |
|---|---|---|
| San Joaquin, CA | 853,539 | 39.5% |
| Stanislaus, CA | 581,947 | 26.9% |
| Merced, CA | 358,318 | 16.6% |
| Tuolumne, CA | 62,913 | 2.9% |
| Alameda, CA | 61,375 | 2.8% |
| Calaveras, CA | 50,894 | 2.4% |
| Sacramento, CA | 46,995 | 2.2% |
| Amador, CA | 41,024 | 1.9% |
| Contra Costa, CA | 31,200 | 1.4% |
| Mariposa, CA | 23,283 | 1.1% |
| Fresno, CA | 19,856 | 0.9% |
| Madera, CA | 19,856 | 0.9% |
| El Dorado, CA | 9,276 | 0.4% |
| Alpine, CA | 2,934 | 0.1% |
Area Code 350 Family Tree
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Area code 350 was originally assigned in 28-Nov-2022 to serve CA.
Call Context
This area code covers a geographic region across CA, including Stockton and surrounding communities.
Nearby Area Codes
Area codes geographically closest to 350.
Other Area Codes in California
Area codes that also serve California, linked for easy comparison.