Economic growth followed, due in part to these government institutions and also to the rise of industry along the Merrimack River, which flows through the city east of the downtown area, and the arrival in the 1840s of the railroad.

The New Hampshire State House was built in 1819 south of the traditional center of the city (now the Concord Historic District), and the commercial heart of the city began to take shape along the First New Hampshire Turnpike south of the State House (now Main Street).

It does not include the New Hampshire State House or its grounds, which are listed as part of the Concord Civic District.

The oldest wood-frame building is the 1819 wood frame Upham-Walker House on Park Street, which is separately listed on the National Register.

[2] Media related to Downtown Concord Historic District at Wikimedia Commons