Season 4 aired between 22 Sep 2011 and 10 May 2012, 22 episodes.
Episodes
E01
I'm Leslie Knope
22 Sep 2011
E02
Ron and Tammys
29 Sep 2011
E03
Born and Raised
06 Oct 2011
E04
Pawnee Rangers
13 Oct 2011
E05
Meet 'n' Greet
27 Oct 2011
E06
End of the World
03 Nov 2011
E07
The Treaty
10 Nov 2011
E08
Smallest Park
17 Nov 2011
E09
The Trial of Leslie Knope
01 Dec 2011
E10
Citizen Knope
08 Dec 2011
E11
The Comeback Kid
12 Jan 2012
E12
Campaign Ad
19 Jan 2012
E13
Bowling for Votes
26 Jan 2012
E14
Operation Ann
02 Feb 2012
E15
Dave Returns
16 Feb 2012
E16
Sweet Sixteen
23 Feb 2012
E17
Campaign Shake-Up
01 Mar 2012
E18
Lucky
08 Mar 2012
E19
Live Ammo
19 Apr 2012
E20
The Debate
26 Apr 2012
E21
Bus Tour
03 May 2012
E22
Win, Lose, or Draw
10 May 2012