The show follows Leslie Knope's (Amy Poehler) work for the Parks and Recreation department of the fictional town Pawnee, Indiana.
From episode 2x21 "94 Meetings".
From episode #515 "Partridge".
Source: I Am Not a Stalker
From episode 7x02 "Ron & Jammy".
In episode S4E11 The Comeback Kid, Ron Swanson drives past this building when the cop pulls him over and he pulls up along side it.
Exterior of Pawnee City Hall.
In season four's "Bowling for Votes" Leslie holds a bowling night in order to win over a man who does not plan to vote for her.
The gym at Walter Reed is used for some Pawnee public forums.
Source: Franklin Avenue
Interior of JJ's Diner was filmed at Four'N 20. Leslie and Ben frequently met up with Jennifer (Kathyrn Hahn), the campaign manager for Bobby Newport.
Interiors scenes in The Bulge are filmed at Serra's.