Get a local business phone number in Chelsea, MI

Area codes in Chelsea

Chelsea, in Washtenaw County, Michigan, had a Census-estimated population of 5,393 in July 2024. All 9 exchanges NANPA lists for its rate center are in area code 734. 734 is part of an overlay with 679, so a new local number in Chelsea may carry any of those codes depending on which have numbers available. Chelsea is in the Eastern time zone.

According to NANPA's dialing-plan data, local calls within 734 are dialed as seven digits and toll calls as 1 plus ten digits.

Phone carriers in Chelsea

7 carriers hold the 9 exchanges assigned to Chelsea's rate center. Michigan Bell Tel CO has the most, with 2. 8 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. The table counts codes by the operating company NANPA assigned them to, not by who serves each number today.

Exchanges (NPA-NXX) assigned in Chelsea

These are the central office codes NANPA records for Chelsea. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2001. 2 of the 9 were assigned in 2020 or later.

When Chelsea's exchanges were assigned

Assignment dates show when each block of Chelsea numbers was added to the local supply.

Rate centers and local calling in Chelsea

Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. Chelsea's numbers are rated to the CHELSEA rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a Chelsea number.

New local numbers are drawn from carrier inventory, so the exact 734 numbers available change over time; porting an existing number is free.

Who does business near Chelsea

Chelsea is part of the Ann Arbor, MI metro area, home to 374,000 people in 2024. County Business Patterns counted 8,322 business establishments in the Ann Arbor, MI metro area in 2023, employing 158,858 people. The largest sectors by establishment count are professional, scientific, and technical services (1,301), retail trade (1,065), and health care and social assistance (1,051).

Setting up a Chelsea business line

Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.

If you already have a number in Chelsea, 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.

A 19-person team is the benchmark here, the rounded average establishment size in the Ann Arbor, MI metro area. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $570.00 a month and Ooma Office Pro $474.05. On Callata the same 19 people cost $379.00 a month, less than either per-seat plan.