Claremont is the only city in Sullivan County, New Hampshire, United States. The population was 12,949 at the 2020 census. Claremont is …Claremont is the only city in Sullivan County, New Hampshire, United States. The population was 12,949 at the 2020 census. Claremont is a core city of the Lebanon–Claremont micropolitan area, a bi-state, four-county region in the upper Connecticut River valley.
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