Dear Ms. Callanan,
Thank you for posting your request on History Hub!
We searched the Hathitrust Catalog and located the publication 16th census of the United States, 1940. Population and housing. Statistics for census tracts Prepared under the supervision of Dr. Leon E. Truesdell, chief statistician for population Seattle, Wash that may contain the information that you seek. We also suggest that you consult Explore Census Data or IPUMS USA to extract and analyze your selected 1940 Census data.
We hope this is helpful. Best of luck with your research!