I am working on mapping the districts to city/town using the census tiger database for 2020. unfortunately, I could not find any relational keys to map the congressional districts to cities/towns.
Another alternative would be to use the 2020 Census Block Assignment Files and identify the city/town and district relationship. www.census.gov/.../block-assignment-files.html
I have reviewed one of the files and it seems this is what I was looking for. thank you.
Personally I didn't see any accuracy problems, though it took me a few tries to get just the right proportion variables set so I saw what I wanted to see as a proportion: city X is y percent of CD Z by…