I have one location:
16 Center Street Suite 523 Northampton. It is off of main street or state street. It is located between Gazebo Bra and The Iron Horse Music venue. It has a green awning and is also known as "The Central Chambers Building"
Parking is available across Main street in the municipal parking lot at Thornes marketplace. It is also available at the street pay meters, in the TD bank lot on Center St. ($), in the new ticket lot on Masonic Street, behind the police station (walk-way to center street) and the ticket lot behind starbucks. There is one handicap spot on Center and two just around the corner on Main street in front of the First Church.
Parking at meters is free on Sundays and after 6 PM.
Most meters on Center St. are for a maximum of two hours. Be warned that you will be ticketed even if you re-fill your meter after two hours. I learned the hard way!