NASHUA, a city and one of the county-seats of Hillsboro co., N. H.; on the Nashua river and on the Boston and Maine railroad; 35 miles S. of Concord. It contains a public library, several public institutions, several daily papers, electric lights, electric street railroads, waterworks, and National and savings banks. It has manufactories of edge tools, iron and steel, engines, shoes, bobbins and shuttles, locks, cotton goods, furniture, carpets, etc. Pop. (1910) 26,005; (1920) 28,379.