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- [S1924] Hecker, Frank F. (I20603): 1920 US Census, (www.ancestry.com (2005): National Archives and Records Administration micropublication T625, roll 1567; enumeration district (ED) 145, sheet 5B, page 239, line 81, dwelling 21, family 21; image accessed 4/17/2009.), 1920.ST.CO.TWP.ED.#.
- [S1925] Hecker, Frank F. (I20603): 1930 US Census, (www.ancestry.com (2002): National Archives and Records Administration micropublication T626, roll 2037; enumeration district (ED) 125, sheet 19A, page 243, line 32, dwelling 490, family 492; image accessed 4/17/2009.), 1930.PA.Erie.Millcreek.125.37.
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