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 | Official name: State of Montana Montana postal code abbreviation: MT Montana prefix phone numbers: 406 You may also be interested in the answers to the following questions: Total area: 381 156 km2 ✅ What is the largest city by population in Montana?- Largest Montana cities by population: Billings ✅ What is the capital of Montana?- State capital of Montana: Helena ✅ What is the population of Montana?- Montana state population 2025: 998 199 |