Please note that when parking on Main Street or the immediate downtown side streets there is a two hour time limit. Parking needs to be prepaid at one of the kiosks (credit card or coins. credit card has a one hour minimum. cost is $0.75 an hour) and your receipt returned to your dashboard. Parking is also available on the side streets (some kiosks, some coin meters) and 3 convenient parking garages: Durgin Block (accessible from Warren St), Firehouse (on S State St, by the YMCA) & the first two floors of the Capital Commons (accessible on Storrs St) with no maximum on the amount of time in the garages. Garage parking is less expensive at $0.50 an hour. A ticket for an expired meter/space on the street or in the garage is $10.
On all downtown streets / garages, parking is free after 5 pm weekdays, and all day Saturday, Sunday and City Holidays. Pay parking begins weekdays at 8 am and ends at 5 pm.
Simple, printable map of downtown Concord, NH here