Nashua is a city located in Hillsborough County, New Hampshire. It is the second largest city in the state and is situated along the banks of the Merrimack River. The city is known for its historic downtown area and is home to many businesses and industries. Nashua is also the home of the University of New Hampshire at Manchester. The city is often referred to as 'Merrimack City on the Merrimack' due to its location on the river.