Get a local business phone number in Sister Bay, WI

What area code is Sister Bay, WI?

Sister Bay village is a Census place in Door County, Wisconsin, with an estimated 1,170 residents in 2024. All 3 exchanges NANPA lists for its rate center are in area code 920. 920 is part of an overlay with 274, so a new local number in Sister Bay may carry any of those codes depending on which have numbers available. Sister Bay is in the Central time zone.

According to NANPA's dialing-plan data, local calls within 920 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.

Who holds Sister Bay phone exchanges

3 carriers hold the 3 exchanges assigned to Sister Bay's rate center. Michigan Wireless, LLC d/b/a Bug Tussel Wireless has the most, with 1. 3 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.

Sister Bay phone prefixes

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Sister Bay's rate center (SISTER BAY). The earliest assignment date recorded in the file for these codes is 2009. 1 of the 3 were assigned in 2020 or later.

When Sister Bay's exchanges were assigned

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

Rate centers and local calling in Sister Bay

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

New local numbers are drawn from carrier inventory, so the exact 920 numbers available change over time; porting an existing number is free.

Businesses around Sister Bay

Sister Bay is outside any Census metro or micropolitan area, so the figures below are statewide. County Business Patterns counted 144,774 business establishments in Wisconsin in 2023, employing 2,642,958 people. The largest sectors by establishment count are retail trade (18,044), health care and social assistance (17,592), and accommodation and food services (15,530).

A Sister Bay number on Callata

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.

Porting a number you already use in Sister Bay 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.

An 18-person team is the benchmark here, the rounded average establishment size in Wisconsin. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $540.00 a month and Ooma Office Pro $449.10. Callata comes to $359.00 a month for 18 users ($99 a month with 5 users included, then $20 per additional user), below both.