what county is concord, nh
About Merrimack County Merrimack County is a county in the U.S. state of New Hampshire which has two cities and twenty-five towns. In 2006 the population was 148,085. Its county seat is Concord. The center of population of New Hampshire is located in Merrimack County, in the town of Pembroke. Merrimack County was organized at Concord in 1823, and is named for the Merrimack River. It was formed by removing towns from northern Hillsborough and Rockingham Counties.