Salem is a town in Rockingham County, New Hampshire, United States. The population was 30,089 at the 2020 census and an estimated 30,647 in 2022. Salem is a northern suburb of Boston located on Interstate 93. As the first town along I-93 northbound in New Hampshire, which lacks any state sales tax, Salem has grown into a regional commercial hub for many nearby Massachusetts towns, anchored by the Mall at Rockingham Park and Tuscan Village. Other major sites include Canobie Lake Park, a large amusement park; and America's Stonehenge, a stone structure of disputed origins. It is the former home of Rockingham Park, a horse racetrack. The Sununu political family hails from Salem, including former New Hampshire governor and White House Chief of Staff John H. Sununu, and his sons John E. Sununu, a former U.S. senator, and Chris Sununu, current New Hampshire governor.

Rockingham County is a county in the U.S. state of New Hampshire. As of the 2020 census, the population was 314,176, making it New Hampshire's second-most populous county. The county seat is Brentwood. Rockingham County is part of the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area and the greater Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area. Per the 2020 census, it was New Hampshire's fastest growing county from 2010 to 2020.