San Francisco, CA business phone guide

San Francisco, CA at a glance

The San Francisco-Oakland-Fremont, CA metro area covers 5 counties in California and had 4.6 million residents in July 2024, down 2.2% since April 2020. The U.S. population grew 2.6% over the same period. Alameda County, CA is the most populous, with 1.6 million people. By population it ranks 13th of the 925 metro and micropolitan areas and 11th by business establishments.

Businesses in San Francisco, CA

County Business Patterns counted 133,246 establishments in the area in 2023, employing 2,417,363 people in mid-March with $313.9 billion in annual payroll. That is an average of 18.1 employees per establishment. 55.8% of establishments with employees had fewer than five people. By establishment count, the largest sectors are professional, scientific, and technical services (23,140), health care and social assistance (16,920), and accommodation and food services (13,736).

Business density and team size in San Francisco, CA

San Francisco, CA has 28.7 business establishments per 1,000 residents, 16.6% above the U.S. figure of 24.6. Establishments average 18.1 employees against 16.7 nationally, and payroll per employee is $129,839 (90.0% above the U.S. $68,342). 55.8% of establishments with employees have fewer than five people (U.S.: 55.5%), while 5.6% have 50 or more. Most establishments are far smaller than the average suggests, so it pays to price a phone plan at the headcount you actually have rather than the average.

Small-business industries in San Francisco, CA

Of the 141 industries these guides cover, 141 have a published Census count in San Francisco, CA. The largest are full-service restaurants (5,136), limited-service restaurants (4,140), and dental offices (3,029). Relative to population, custom computer programming services firms are the most over-represented: 63.7 per 100,000 residents against 20.0 nationally.

Which area codes serve San Francisco, CA

The area's named cities and towns have 1,734 NANPA-assigned exchanges across 6 area codes; 415 has the most (36%). A local number in the code your customers know is the simplest signal that you are nearby; Callata's plan includes up to 3.

Local numbers by city

Pages for 27 cities and towns in the area list their area codes, prefixes and carriers.

Phone costs for a typical San Francisco, CA business

The comparison below uses 18 users, the rounded average establishment size in San Francisco, CA. At list prices checked September 28, 2026, that is $449.10 a month on Ooma Office Pro and $540.00 on RingCentral RingEX Core. On Callata the same 18 people cost $359.00 a month, less than either per-seat plan.

Callata in San Francisco, CA

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.

If you already have a number in San Francisco, CA, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.

Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.