Get a local business phone number in Walnut Creek, CA

Walnut Creek area codes

With 70,817 residents in the Census 2024 estimate, Walnut Creek sits in Contra Costa County, California. All 103 exchanges NANPA lists for its rate center are in area code 925. Walnut Creek 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 Walnut Creek phone exchanges

24 carriers hold the 103 exchanges assigned to Walnut Creek's rate center. Pacific Bell has the most, with 35. 54 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in Walnut Creek can come from any of these blocks; once it is yours, porting lets it move between providers.

Walnut Creek phone prefixes

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Walnut Creek's rate center (WALNUT CRK). The earliest assignment date recorded in the file for these codes is 2001. 5 of the 103 were assigned in 2020 or later.

When Walnut Creek's exchanges were assigned

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

Rate centers and local calling in Walnut Creek

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

New local numbers are drawn from carrier inventory, so the exact 925 numbers available change over time; porting an existing number is free.

Businesses around Walnut Creek

Walnut Creek 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 Walnut Creek 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 Walnut Creek 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.