- 1944
- March
- March 17, 1944
- Charlotte Cobel born.

- (Season 1 episode Hide and Seek)
- 1967
- March
- March 29, 1967
- Date of Birth on Billy Hargrove's headstone. (Season 4)

- 1978
- April
- April 3, 1978
- Date of Birth of Mark's driver license.

- 1985
- July
- July 4, 1985
- Date of Death on Billy Hargrove's headstone. (Season 4)

- 2020
- April
- April 24, 2020
- Date on Mark's driver license.

- Annual Event or Year Unknown
- June
- June 16
- Date of Matthew Blades' parents' 50th anniversary, one of the severed employees listed in the paperwork that Irving's innie finds in his house. (Season 1 episode The We We Are)

- November
- November 3
- A Dorner Therapeutics truck blows up in New York, which severed Lumon Industries severed employee Peg Kincaid suspects is connected to the work her innie performed. (episode The Lexington Letter)

- November 10
- Severed Lumon Industries employee Peg Kincaid writes a letter to Topeka Star newspaper reporter Daria Thorne. (episode The Lexington Letter)

- November 11
- According to her obituary, Severed Lumon Industries employee Peg Kincaid passes away from complications from car accident. (episode The Lexington Letter)

- November 12
- Topeka Star reporter Daria Thorne sends email to editor Jim Milchik with attached letter from severed Lumon Industries employee Peg Kincaid. (episode The Lexington Letter)

- November 13
- Reporter Daria Thorne and editor Jim Milchik exchange emails regarding the letter from Severed Lumon Industries employee Peg Kincaid. (episode The Lexington Letter)

- November 20
- Date of scheduled memorial for Severed Lumon Industries employee Peg Kincaid, following her death from complications from a car accident. (episode The Lexington Letter)

|