Get a local business phone number in Antioch, CA

Antioch area codes

Antioch city is a Census place in Contra Costa County, California, with an estimated 118,453 residents in 2024. All 67 exchanges NANPA lists for its rate center are in area code 925. Antioch 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.

Who holds Antioch phone exchanges

18 carriers hold the 67 exchanges assigned to Antioch's rate center. T-mobile USA, INC. has the most, with 16. 48 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in Antioch can come from any of these blocks; once it is yours, porting lets it move between providers.

Antioch phone prefixes

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Antioch's rate center (ANTIOCH). The earliest assignment date recorded in the file for these codes is 2001. 15 of the 67 were assigned in 2020 or later.

When Antioch's exchanges were assigned

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

Rate centers and local calling in Antioch

What a caller sees as "local" is the area code plus prefix. In Antioch, those come from the ANTIOCH rate center, as recorded by NANPA.

If your business already has a Antioch number, porting it to Callata is free and keeps it on your cards, listings and vehicles.

Businesses around Antioch

Antioch 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).

Setting up a Antioch business line

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 Antioch 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.