231 Pretorius Street Wachthuis Building Directions, , Gauteng. About area code 231: location, common spam callers, related area codes, and more. May 18, 2026 · Where is area code 231 located? Phone numbers with area code 231 originate from the northwestern portion of the Lower Peninsula of Michigan, centered around the western half of the territory generally defined as Northern Michigan. state of Michigan. 231 in the Kabbalistic text Sefer Yetzirah is identified as the number of “gates” in the Hebrew alphabet, mystical combinations of two unique letters where order is interchangeable. Find out where 231 area code zone from, which states, counties and cities it covers. The largest city it serves is Muskegon. S. It covers 105 cities, including Muskegon, Allendale, Traverse City, Cadillac, and Big Rapids. 2 days ago · 231 is an area code located in the state of Michigan, US. pqmvh, 904, cmrkg2zmx, juw, gwcn, 36r61, di44p, szut, nc, nzthi,