Get a local business phone number in Martinez, CA

Area codes in Martinez

With 37,006 residents in the Census 2024 estimate, Martinez sits in Contra Costa County, California. All 22 exchanges NANPA lists for its rate center are in area code 925. Martinez is in the Pacific time zone.

According to NANPA's dialing-plan data, local calls within 925 are dialed as 1 plus ten digits and toll calls as 1 plus ten digits.

Phone carriers in Martinez

10 carriers hold the 22 exchanges assigned to Martinez's rate center. Pacific Bell has the most, with 7. 17 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. Holding a code means NANPA assigned that block of numbers to the carrier for this rate center; individual numbers may since have been ported elsewhere.

Local prefixes for Martinez

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Martinez's rate center (MARTINEZ). The earliest assignment date recorded in the file for these codes is 2001. 2 of the 22 were assigned in 2020 or later.

When Martinez's exchanges were assigned

The table groups Martinez's exchanges by the decade NANPA recorded them as assigned.

What makes a number local to Martinez

NANPA ties every exchange to a rate center. For Martinez that is MARTINEZ, so a number from one of these exchanges reads as local to people in and around Martinez.

Keeping an existing Martinez number costs nothing on Callata, because porting is free; a new number depends on what carriers have open in 925 when you pick it.

The local business market

Martinez is part of the San Francisco-Oakland-Fremont, CA metro area, home to 4.6 million people in 2024. County Business Patterns counted 133,246 business establishments in the San Francisco, CA metro area in 2023, employing 2,417,363 people. The largest sectors by establishment count are professional, scientific, and technical services (23,140), health care and social assistance (16,920), and accommodation and food services (13,736).

Business phone service in Martinez

For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.

Porting a number you already use in Martinez is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.

The comparison below uses 18 users, the rounded average establishment size in the San Francisco, CA metro area. At list prices checked September 28, 2026, that is $449.10 a month on Ooma Office Pro and $540.00 on RingCentral RingEX Core. Callata comes to $359.00 a month for 18 users ($99 a month with 5 users included, then $20 per additional user), below both.