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 | Official name: State of New Hampshire New Hampshire postal code abbreviation: NH New Hampshire prefix phone numbers: 603 You may also be interested in the answers to the following questions: Total area: 24 217 km2 ✅ What is the largest city by population in New Hampshire?- Largest New Hampshire cities by population: Manchester ✅ What is the capital of New Hampshire?- State capital of New Hampshire: Concord ✅ What is the population of New Hampshire?- New Hampshire state population 2025: 1 318 194 |