Details of Leonard's birth are not known.

Leonard married Signa Lavender in 1929 in Shardlow, Staffordshire.

He had the following children from his marriage to Signa Lavender:

- Betty Crouch	born in 1930 in Shardlow, Staffordshire.
- Frank Crouch	born in 1932 in Shardlow, Staffordshire.
- Reginald E. Crouch	born in 1933 in Shardlow, Staffordshire.
- Kathleen M. Crouch	born in 1936 in Shardlow, Staffordshire.
- Jean A. Crouch	born in 1938 in Basford, Nottinghamshire.
- Leonard J. Crouch	born in 1942 in Basford, Nottinghamshire.

Details of Leonard's occupation are not known.