Rochester is a city in Strafford County, New Hampshire, USA. As of the 2000 census, the city population was 28,461, the largest in New Hampshire's Seacoast region. The New Hampshire Office of Energy and Planning estimated its population at 30,684 in 2005, making it the New Hampshire community with the third greatest population increase since 2000. The city includes the villages of East Rochester and Gonic. Rochester is home to Skyhaven Airport and the annual Rochester Fair. Rochester apartments for rent comparison page shows most up to date rent information on Rochester apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.