Welcome to History Hub,
My thoughts on the subject and one specific group.
Unless you are speaking of a house being designed and built by architect Frank Lloyd Wright and/or others in the 1940's I cannot see anyone wanting to put the Cape Cod Box-Style houses that were built post war.on any Historic Register. In my state these developments were built near the air bases for veterans to purchase the homes, They were ideal for young coples just starting a family. I lived in one of them in the mid 1970's, for several years, and I know that 4 of my neighbors were the original homeowners and remained in the houses for the remainder of their lives which would have been over 50 years and had jobs at the auto plant. So I guess you might call those, less than 1000 square foot houses, historic. The specific group that I am talking about here would be World War 2 veterans.
Dear Ms. Hudziak,
Thank you for posting your request on History Hub!
We suggest that you review the United States Census Bureau’s Explore Census Data site or About the Census Library to build information on the historical demographics and economic patterns of the specific locations you seek. Also, browsing the listings at the National Register of Historical Places website may provide an idea of the sources contributing to eligibility.
We hope this is helpful. Best of luck with your research!