| Sources  | 
- [S38]  1880 US Federal Census. 
 
  
- [S19]  1900 US Federal Census, (www.ancestry.com). 
 
  
- [S30]  1910 US Federal Census, (www.ancestry.com). 
 
  
- [S24]  1920 US Federal Census, (www.ancestry.com).
 
Name: Anton P Koy Age: 40 years Estimated birth year: 1879 Birthplace: Illinois Race: White Home in 1920: Casner, Jefferson, Illinois  Roll: T625_376 Page: 5A ED: 118 Image: 0302 
 
  
- [S25]  1930 US Federal Census, (www.ancestry.com).
 
Name: Anthony Koy Home in 1930: St Louis, St Louis (Independent City), Missouri Age: 51 Estimated Birth Year: abt 1879 Birthplace: Illinois Relation to Head of House: Head Spouse's Name: Anna Race: White 
 
  
- [S891]  World War I Draft Registration Cards, 1917 - 1918, (www.ancestry.com).
 
Name: Anton Paul Koy City: Chicago County: Cook State: Illinois Birth Date: 08 Apr 1879 Race: White Roll: 1503984 DraftBoard: 81 
 
  
- [S66]  Missouri Death Certificates, 1910 ? 1956, (http://www.sos.mo.gov/archives/resources/deathcertificates). 
  
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