All ratings data from TV by the Numbers.
September 20, 2012: ‘New Guys’
Final ratings: 4.28 million viewers, 2.1/6 rating/share 18-49.
Placement: 2nd place behind Glee.
September 27, 2012: ‘Roy’s Wedding’
Final ratings: 4.13 million viewers, 2.1/6 rating/share 18-49.
Placement: 4th place behind Grey’s Anatomy, Person of Interest, and Glee.
October 4, 2012: ‘Andy’s Ancestry’
Final ratings: 4.14 million viewers, 2.2/6 rating/share 18-49.
Placement: 4th place behind Grey’s Anatomy, Person of Interest, and Glee.
October 18, 2012: ‘Work Bus’
Final ratings: 4.28 million viewers, 2.1/6 rating/share 18-49.
Placement: 3rd place behind Grey’s Anatomy and Person of Interest. (NFL and MLB games also going on at this time)
October 25, 2012: ‘Here Comes Treble’
Final ratings: 4.0 million viewers, 1.9/5 rating/share 18-49.
Placement: 3rd place behind Person of Interest and Grey’s Anatomy. (NFL and MLB games also going on at this time)
November 8, 2012: ‘The Boat’
Final ratings: 4.83 million viewers, 2.4/6 rating/share 18-49.
Placement: 3rd place behind Grey’s Anatomy and Person of Interest. (NFL game also going on at this time)
November 15, 2012: ‘The Whale’
Final ratings: 4.16 million viewers, 2.1/6 rating/share 18-49.
Placement: 4th place behind Person of Interest, Grey’s Anatomy, and Glee.
November 29, 2012: ‘The Target’
Final ratings: 3.88 million viewers, 1.9/5 rating/share 18-49.
Placement: 4th place behind Grey’s Anatomy, Person of Interest, and Glee.
December 6, 2012: ‘Dwight Christmas’
Overnight ratings: 4.175 million viewers, 2.1/6 rating/share 18-49.
Placement: 4th place behind Person of Interest, Grey’s Anatomy, and Glee.
January 10, 2013: ‘Lice’
Final ratings: 4.54 million viewers, 2.2/6 rating/share 18-49.
Placement: 3rd place behind Person of Interest and Grey’s Anatomy.
January 17, 2013: ‘Suit Warehouse’
Final ratings: 4.15 million viewers, 2.1/5 rating/share 18-49.
Placement: 2nd place behind Grey’s Anatomy.
January 24, 2013: ‘Customer Loyalty’
Final ratings: 4.19 million viewers, 2.0/5 rating/share 18-49.
Placement: 3rd place behind Grey’s Anatomy and Glee.
January 31, 2013: ‘Junior Salesman’
Final ratings: 4.45 million viewers, 2.1/5 rating/share 18-49.
Placement: 3rd place behind Person of Interest and Grey’s Anatomy.
January 31, 2013: ‘Vandalism’
Final ratings: 3.97 million viewers, 1.9/5 rating/share 18-49.
February 7, 2013: ‘Couples Discount’
Final ratings: 4.15 million viewers, 2.1/6 rating/share 18-49.
Placement: 4th place behind Person of Interest, Grey’s Anatomy, and Glee.
February 14, 2013: ‘Moving On’
Final ratings: 4.06 million viewers, 2.0/6 rating/share 18-49.
Placement: 3rd place behind Person of Interest and Grey’s Anatomy.
March 14, 2013: ‘The Farm’
Final ratings: 3.54 million viewers, 1.9/5 rating/share 18-49.
Placement: 4th place behind Person of Interest, Grey’s Anatomy, and Glee.
April 4, 2013: ‘Promos’
Final ratings: 3.44 million viewers, 1.8/5 rating/share 18-49.
Placement: 4th place behind Person of Interest, Grey’s Anatomy, and New Girl.
April 11, 2013: ‘Stairmageddon’
Final ratings: 3.83 million viewers, 1.9/5 rating/share 18-49.
Placement: 2nd place behind Glee.
April 25, 2013: ‘Paper Airplane’
Final ratings: 3.25 million viewers, 1.7/5 rating/share 18-49.
Placement: 4th place behind Grey’s Anatomy, Person of Interest, and Glee. (NFL draft also airing at same time)
May 2, 2013: ‘Livin’ the Dream’
Final ratings: 3.51 million viewers, 1.8/5 rating/share 18-49.
Placement: 2nd place behind Two and a Half Men.
May 9, 2013: ‘A.A.R.M.’
Final ratings: 4.56 million viewers, 2.3/6 rating/share 18-49.
Placement: 3rd place behind Grey’s Anatomy and Person of Interest.
May 16, 2013: ‘Finale’
Final ratings: 5.69 million viewers, 3.0/8 rating/share 18-49.
Placement: 2nd place behind Grey’s Anatomy.
Key
More viewers than previous episode
Less viewers than previous episode
You can find Nielsen ratings of other seasons here.