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is a town in Coos County, New Hampshire, United States. The population was 298 at the 2000 census. Its ZIP code is 03579. It is located north of the White Mountains along Route 16 at the intersection of Route 26. It has a municipal airport with a single, unpaved runway (airport code ERR).
Errol was chartered in 1774 and incorporated in 1836. The name is taken from Scotland's James Hay, 15th Earl of Erroll.