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The American Census of 1940, before WW2, can be obtained at Ancestry.com for free. Enter the name and related
known data and the census form can be obtained. The 1940 census data included various biometrics and occupational data.
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Dear Ms. Macri,
Thank you for contacting History Hub!
If your great-grandfather lived in the U.S. in 1940, the best place to look is the 1940 U.S. Federal Census. The 1940 U.S. Federal Census is available online for free through FamilySearch and the National Archives, or for a fee through Ancestry. Ancestry is available for free at any National Archives location nationwide. To find a location near you, please visit https://www.archives.gov/locations.
For genealogy help, we suggest you visit a Family Search History Center or Affiliate Library which are located worldwide. To find a location near you, please visit https://www.familysearch.org/locations/.
Best of luck in your research!