page_title: Hillsborough County, New Hampshire
hierarchical_section_title: Hillsborough County, New Hampshire
context_page_description: Hillsborough County is the most populous county in the U.S. state of New Hampshire. As of the 2010 census, the population was 400,721. The population was estimated at 417,025 in 2019. Its county seats are Manchester and Nashua. Hillsborough is northern New England's most populous county as well as its most densely populated. Hillsborough County comprises the Manchester-Nashua, NH Metropolitan Statistical Area, which in turn constitutes a portion of the Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area.
context_section_description: Hillsborough County is the most populous county in the U.S. state of New Hampshire. As of the 2010 census, the population was 400,721. The population was estimated at 417,025 in 2019. Its county seats are Manchester and Nashua. Hillsborough is northern New England's most populous county as well as its most densely populated. Hillsborough County comprises the Manchester-Nashua, NH Metropolitan Statistical Area, which in turn constitutes a portion of the Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area.
caption: New Hampshire's location within the U.S.