California · Pacific Time
Modesto, CA Area Codes
Modesto is served by 2 area codes (209, 350). Here's which is original, which are overlays, and how to pick one for a new local number.
Last updated October 3, 2026 · Source: NANPA
Area codes serving Modesto
Modesto sits in California, part of the West region and the Pacific Time zone. Its numbers are spread across an overlay of 2 codes that all cover the same ground: 209, 350.
The original code is 209 (in service since 1958). As the area ran low on numbers, regulators added overlay codes on top instead of splitting the city, so longtime residents kept their numbers while new lines received a newer code.
| Code | Area served | In service |
|---|---|---|
| 209 | Northern San Joaquin Valley and Sierra foothills including Stockton, Modesto and Merced | January 1, 1958 |
| 350 | Northern San Joaquin Valley and Sierra foothills including Stockton, Modesto and Merced | November 28, 2022 |
Nearby cities sharing these area codes
- Stockton
- Merced
- Tracy
- Manteca
- Turlock
- Lodi
- Ceres
- Los Banos
- Oakdale
- Atwater
- Riverbank
- Sonora
How to pick an area code for a new number
When you activate a new line in Modesto, the carrier assigns whichever code has numbers available — you usually can't choose. If a specific code matters to you (for example the prestige of 209), ask the carrier whether any blocks remain, or request a number transfer. All codes here dial identically and cost the same.
Dialing in Modesto
Because Modesto is an overlay area, 10-digit dialing is mandatory: always dial the area code plus the seven-digit number, even for a neighbor. From outside the US, dial +1, then the area code and number. See 10-digit dialing and overlay area codes for the background. For every code in California, visit the California area codes page.
Quick answers
Modesto area code FAQ
What area codes does Modesto use?
Modesto, CA is served by 2 area codes: 209, 350.
Which is the original Modesto area code?
209 is the original code for Modesto, in service since 1958; the others were added later for more numbers.
What time zone is Modesto in?
Modesto is in the Pacific Time zone.
Do I need to dial the area code in Modesto?
Yes. With multiple overlapping codes, 10-digit dialing is required for every call in this area.