Area code 650: California
What is area code 650?
Area code 650 is a US state area code for California, on Pacific Time. It has 710 prefixes in service across 15 rate centers, the largest being Palo Alto, San Mateo and Mountain View. NANPA lists no overlay code for it. Local calls there take 1 + 10 digits. The code never shows a line is in service.
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See the phone add-onArea code 650 facts
| Location | California, United States |
|---|---|
| Time zone | Pacific Time |
| Overlays | None |
| Split from | 415 |
| In service since | August 2, 1997 |
| Local calls | 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
In short: 650 is California (Pacific Time). Format checks here are free and run in your browser; the current carrier and line type need a live lookup. Bulk phone number validator · Pro + Phone plan
Local time in area code 650
America/Los_Angeles
Prefixes in service
710 of 792 possible
15 rate centers
Which cities and towns use area code 650?
NANPA records each prefix against a rate center, the local billing area a number belongs to, usually named after its main town. These are the 650 rate centers with the most prefixes in service. 3 smaller ones aren't listed.
| Rate center | Prefixes |
|---|---|
| Palo Alto | 145 |
| San Mateo | 125 |
| Mountain View | 92 |
| South San Francisco | 88 |
| Redwood City | 64 |
| San Carlos-Belmont | 44 |
| Los Altos | 28 |
| Millbrae | 24 |
| San Francisco:Juniper Da | 22 |
| Half Moon Bay | 20 |
| Pacifica | 17 |
| Woodside | 14 |
Source: NANPA central office code assignments, file dated 10/17/2026. Each prefix holds up to 10,000 numbers.
How do I dial a 650 number?
NANPA's dialling plan for 650: local calls inside the code take 1 + 10 digits, toll calls 1 + 10 digits. From another area code, dial 1 first. From abroad, use +1. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 650 | 1-650-555-0147 |
|---|---|
| From another US or Canadian area code | 1-650-555-0147 |
| From outside North America | +1 650 555 0147 |
| E.164, for CRMs and SMS tools | +16505550147 |
When did area code 650 start?
Area code 650 went into service on August 2, 1997, split from 415. It has no overlay, so every number in its area still starts with it.
Tools for 650 numbers
- Bulk phone number validator
Format, country and number type for every number in a CSV, with E.164 output.
- Area code lookup
Look up any code or a whole list of numbers, or find the codes for a state or city.
- Area code time zone
Local time for a list of numbers, with a callable-now flag.
- NPA-NXX lookup
Rate center and state for one prefix, a level below the area code.
- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 650 number tells you where it was issued, not what it is now.
Mobiles, landlines and VoIP lines share area codes, and numbers move between carriers. A live line-type and carrier lookup on every number in your list says which is which, and that decides which calling and texting rules apply. It's in the phone add-on.
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Area code 650 questions
- What state is area code 650?
- Area code 650 is in California, United States. Its largest rate centers by number of prefixes are Palo Alto, San Mateo, Mountain View, South San Francisco and Redwood City.
- What time zone is area code 650 in?
- Pacific Time.
- Does area code 650 have an overlay?
- Not as of NANPA's file dated 10/16/2026. Every number in its area uses 650.
- When did area code 650 start?
- Area code 650 went into service on August 2, 1997, split from 415.
- Is a 650 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
- How many phone numbers does area code 650 have?
- 710 of its 792 possible prefixes are in service, and each prefix holds up to 10,000 numbers. That counts prefixes assigned to carriers, not numbers in use.
- Does a valid format mean a 650 number is in service?
- No. A format check only says the digits fit the North American Numbering Plan and that 650 is an assigned code. It cannot tell whether the number is connected, who answers it or which carrier serves it today, because numbers are reassigned and ported. A live carrier lookup reports the current carrier and line type, but even that is not proof someone answers.
- Can I check a list of 650 numbers for free?
- Yes. Paste them in the list tab above or upload a CSV to the bulk phone number validator: format, E.164, country and the numbering-plan line type are free for every row, with no account. Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month).
Other area codes in California
All California area codes on the area code index.
209213279310323341350357369408415424442510530559562619626628657661669707714738747760805818820831837840858909916925949951
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Prefixes and rate centers: NANPA central office code assignments, 10/17/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.