Portsmouth is New Hampshire's only deep-water seaport and one of the oldest cities in the country, settled in 1623 along the Piscataqua River in Rockingham County. Its compact downtown blends colonial-era architecture with a modern waterfront, anchored by Market Square and the tidal harbor that has shaped the city's economy for four centuries.

The revitalized downtown is home to a nationally recognized restaurant and brewery scene, along with cultural institutions including The Music Hall, Prescott Park, and the Strawbery Banke Museum living history village. Major employers include the nearby Portsmouth Naval Shipyard, Pease International Tradeport's mix of corporate offices and light industry, and a growing base of healthcare and professional services firms.

Portsmouth's neighborhoods range from dense historic districts near the water to quieter residential streets further inland, with housing that commands some of the highest prices on the Seacoast. The city draws young professionals, retirees, and second-home buyers who want walkable urban amenities, coastal access, and easy proximity to Boston, all within a small-city footprint.