area code

Sent logo
Sent TeamMar 8, 2026 / area code / Article

Area Code 231: Coverage, Cities, and Telecommunications Insights

Area code 231 serves Michigan's northwestern Lower Peninsula. Details coverage areas like Muskegon (43.23418?? N), Norton Shores (-86.26395?? W), and Shelby. Explore its 1999 split from 616, NANPA regulations, 10-digit dialing, and telecom infrastructure specifics.

Frequently Asked Questions

What are the dialing requirements for area code 231?

What area code covers Muskegon, Michigan?

When was area code 231 created in Michigan?

What part of Michigan does area code 231 cover?

Why was area code 231 created?

What is the NPA code for northwestern Lower Peninsula of Michigan?

What are the major cities covered by area code 231?

What types of phone services are available in area code 231?

Where can I find a map of area code 231 coverage?

What is the regulatory body for area code 231?

Where can I find more information about area code utilization and exhaust projections?

What area code did 231 split from?

What is the latitude and longitude of Norton Shores, Michigan?

What area code is Muskegon Michigan?

When was area code 231 created?

What part of Michigan is area code 231?

How to dial a number in area code 231?

What is the NPA for northwestern Michigan?

Area code 231 covers which major cities?

What types of phone services use area code 231?

Who regulates area code 231?

Where can I find more information on area code 231?