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AREA CODE · MICHIGAN

Area code 231

Area code 231 covers Muskegon, Michigan. Map, time zone, overlays, carriers, the full list of prefixes and how to dial it.

State: Michigan Major City: Muskegon Eastern Time (ET) Overlay: None
01 / WHERE IT IS

Where is area code 231?

Area code 231 is assigned to Muskegon and the surrounding region in Michigan. Calls to numbers that start with 231 are routed to this area.

Area code 231 is not currently part of an overlay: it serves its territory on its own.

Counties covered

Muskegon CountyGrand Traverse CountyEmmet CountyMecosta CountyAntrim CountyWexford CountyNewaygo CountyCharlevoix CountyManistee CountyMason CountyCheboygan CountyBenzie CountyOsceola CountyMissaukee CountyLeelanau CountyOceana CountyKalkaska County

Line types

  • Mobile 29.25%
  • Landline 70.75%
02 / MAP

Area code 231 on the map

The shaded area joins the code’s numbering centers; the marker shows its main city.

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© OpenStreetMap contributors

03 / LOCAL TIME

Current time in Muskegon

This area code is in the Eastern Time (ET) time zone.

Local timeMuskegon, MI--:--:--

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America/New_YorkLive
04 / HOW TO DIAL

How to call Muskegon

WITHIN THE US231 XXX XXXX

Always 10 digits — landline, mobile or VoIP. Local, long distance or a different state: the format is always the same. You do not need to dial the 1 first.

FROM ABROAD+1 231 XXX XXXX

Exit codes: 00 Europe/Mexico · 011 Canada · 010 Japan · + universal

WHATSAPP / IMESSAGE+1 231 XXX XXXX

Always save the number in international format so messaging apps recognize it correctly:

Call typeTraditional landlineMobile / VoIP
Local (same area code)10 digits10 digits
US long distance1 + 10 digits10 digits
Emergency911911
🌐Universal+1 231 555 0123
🇪🇸🇲🇽Spain / Mexico00 1 231 555 0123
🇦🇺Australia0011 1 231 555 0123
🇯🇵Japan010 1 231 555 0123
HAVE THE FULL NUMBER?

Learn more about that number.

Check the line type and the carrier the number block was originally assigned to.

10 digits to see the carrier and line type of the number

05 / CARRIERS

Carriers in area code 231

Share of the number blocks by carrier and line type.

Landline

AT&T
20%
Frontier Communications
13%
Sinch
12%
ISN
11%
123.net
8%
Others
36%

Mobile

AT&T Mobility
43%
Verizon Wireless
25%
T-Mobile USA
17%
USA Mobility
13%
Sinch
2%

Carrier shown is the original assignment of each number block and may differ today because of number portability.

06 / PREFIXES

Complete list of prefixes for area code 231

571 number blocks (NXX) assigned in this area code.

PrefixTypeCityCarrier
(231) 201 Mobile Chippewa Lake AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC - IL
(231) 202 Mobile Mecosta AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC - IL
(231) 203 Mobile Alanson AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC - IL
(231) 204 Mobile Fife Lake USA MobilityUSA MOBILITY WIRELESS, INC.
(231) 205 Landline Brutus ISNINTERACTIVE SERVICES NETWORK, INC.
(231) 206 Mobile Muskegon T-Mobile USAOMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC
(231) 207 Landline Honor ISNINTERACTIVE SERVICES NETWORK, INC.
(231) 208 Landline Boyne Falls ISNINTERACTIVE SERVICES NETWORK, INC.
(231) 209 Landline Suttons Bay ISNINTERACTIVE SERVICES NETWORK, INC.
(231) 210 Landline St James SinchONVOY, LLCV - MI

Showing 10 of 571 prefixes

07 / FAQ

Frequently asked questions about area code 231

Where is area code 231 used?
Area code 231 serves Muskegon and the surrounding area in Michigan, including Muskegon County, Grand Traverse County, Emmet County, Mecosta County, Antrim County.
What city is area code 231 from?
The main city of area code 231 is Muskegon, MI.
What time zone is area code 231 in?
Area code 231 is in the Eastern Time (ET) time zone (America/New_York).
Is 231 an overlay area code?
No. Area code 231 is not currently part of an overlay.
How do I call a number with area code 231 from the United States?
Dial the 10 digits: 231 + 7-digit number. For some long-distance calls from a landline you may need to add a 1 first.
How do I call a 231 number from another country?
Dial your country's exit code (or +), then 1, then 231 and the seven-digit number. From a mobile you can use +1 231 XXX XXXX.
Which carriers use area code 231?
Most landline blocks belong to AT&T and most mobile blocks to AT&T Mobility. The carrier shown is the original assignment and may differ today because of number portability.
Is area code 231 for landlines, mobiles or both?
Both. About 70.75% of the number blocks are landline, 29.25% mobile.
How do I save a 231 number in WhatsApp or my phone?
Save it in international format: +1 231 XXX XXXX. That way WhatsApp, iMessage and Telegram recognize it from any country.
Is it safe to answer calls from area code 231?
The area code only shows the region a number was assigned to; it does not tell you who is calling. Scammers can fake any area code, so do not share personal or banking information with unknown callers, and let unknown numbers go to voicemail.
KEEP EXPLORING

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