Get a local business phone number in Ann Arbor, MI

What area code is Ann Arbor, MI?

Ann Arbor city is a Census place in Washtenaw County, Michigan, with an estimated 122,925 residents in 2024. All 133 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 Ann Arbor may carry any of those codes depending on which have numbers available. Ann Arbor 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.

Who holds Ann Arbor phone exchanges

21 carriers hold the 133 exchanges assigned to Ann Arbor's rate center. Michigan Bell Tel CO has the most, with 38. 77 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.

Ann Arbor phone prefixes

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Ann Arbor's rate center (ANN ARBOR). The earliest assignment date recorded in the file for these codes is 2001. 11 of the 133 were assigned in 2020 or later.

When Ann Arbor's exchanges were assigned

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

Rate centers and local calling in Ann Arbor

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

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

Businesses around Ann Arbor

Ann Arbor 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).

A Ann Arbor number on Callata

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 Ann Arbor 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 19 users, the rounded average establishment size in the Ann Arbor, MI metro area. At list prices checked September 28, 2026, that is $474.05 a month on Ooma Office Pro and $570.00 on RingCentral RingEX Core. Callata comes to $379.00 a month for 19 users ($99 a month with 5 users included, then $20 per additional user), below both.