From the 1920 Census, Mercer County, Illinois:

New Boston, ED 77
Cameron, Willis H, Head, 27, IL, IL, IL, Farm Operator, General
Florence, Wife, 28, IL, IL, IL
Mary W, Dau, 2-10/12, IL, IL, IL
John H, Son, 1-3/12, IL, IL, IL

Other Cameron's in Mercer County 1920:
Elmer, 55
Charles, 24
Clint, 22
George, 35
Henry, 81 (b. ENG)
Robert W, 38
Ida, 60
Swin E, 32
William D, 33

In 1930:
Illinois, Monmouth, Warren:
575 South C Street
Cameron, Willis H, Head, 37, First Married 22, IL, IL, IL, Fireman Railroad
Florence N, Wife, 38, First married 23, IL, IL, IL, none
Mary W, Dau, 13, IL, IL, IL
John H, Son, 11, IOWA, IL, IL
Juanita M, Dau, 7, IL, IL, IL
Eugene W, Son, 6, IL, IL, IL
Kenneth E, Son, 4, IL, IL, IL
Pauline D, Dau, 2, IL, IL, IL

Note John's birthplace has been changed... How's that?

BB