Source: 1900 Census, where he aged 1, born February 1899.
In the 1910 census, he is living in Andover Town, Tollund County, Connecticut with his parents, aged 11.
By the 1920 Census, he is still in Connecticut, married to Susan Miner and living with her parents, Sherwood A and Amy E Miner, at 9 Church Street, in Hebron Town, Tolland County, Connecticut. He is a loader at a Milk Station, while his father-in-law is a labourer on a Dairy Farm.
Did the L stand for Lloyd as per his son? Yes - his birth entry gives it.
The family must have been in Willimantic in 1923 because that is where their son, Lloyd was born according to his obituary.
By 1930, Harold and Susan are living in their own house, valued at $3500, in Hebron Town, Tollund County, Connecticut, with his daughter, Dorothy C, aged 10 and his son, Lloyd S, aged 6.