b. May 1898
| Birth | May 1898 | Leslie Larsen was born in May 1898 in Missouri. |
| Cen-Head
(Enumerated with) | 12 June 1900 | The 1900 US Census listed Leslie Larsen in addition to Edgar M. Larsen and Effie Louise Timmons in the household of William Henry Larsen, in Castor Township, Stoddard County, Missouri. |
| Cen-Enum | 12 June 1900 | Leslie Larsen was enumerated as Leslie Larsen. Single white male, age 1. Son of head of household. Born May 1898. He was born in Missouri. His father was born in Missouri, his mother in Kentucky. He cannot read, write, or speak English. |
| Cen-Head
(Enumerated with) | 5 May 1910 | The 1910 US Census listed Leslie Larsen in addition to Effie Louise Timmons, Edgar M. Larsen and Charles W. Larsen in the household of William Henry Larsen, in Castor Township, Stoddard County, Missouri. |
| Cen-Enum | 5 May 1910 | Leslie Larsen was enumerated as Leslie A. Larsen. Single white male, age 10. Son of head of household. He was born in Missouri. His father was born in Missouri, his mother in Kentucky. He can speak English. He has no occupation. He can read and write. He attended school since September 1, 1909. |
| Cen-Head
(Enumerated with) | 16 January 1920 | The 1920 US Census listed Leslie Larsen in addition to Charles W. Larsen in the household of Effie Louise Timmons, in Castor Township, Stoddard County, Missouri. |
| Cen-Enum | 16 January 1920 | Leslie Larsen was enumerated as Leslie Larsen. Single white male, age 20. Son of head of household. He did not attend school since September 1, 1919. He can read and write. He was born in Missouri. His father was born in Missouri, his mother in Kentucky. He can speak English. His occupation is farmer at home. |