fips:29037 (Cass), fips:29047 (Clay), fips:29145 (Newton), fips:29165 (Platte): source changed from NYT to USAFacts. Cases and deaths are pretty much unchanged.
fips:29097 (Jasper) changed source and counts increased a lot (cases 9.5k to 15.6k). It looks like USAFacts added all the city of Joplin counts to this county.
fips:29095 (Jackson) changed source and cases and deaths slightly more than doubled. I'm guessing USAFacts added all the Kansas City counts to this county.
TomGoBravo
commented
3 years ago 
This PR addresses https://trello.com/c/6roEMYkZ/1020-switch-to-usa-facts-for-6-mo-counties-nyt-is-under-reporting-kc-joplin-data
Tested
cbsa:27900 (Joplin) cumulative cases increased from 14.8k to 20.9k, an increase that matches number of cases in the city at https://www.joplinmo.org/1072/Joplins-CoronavirusCOVID-19-Response
fips:29037 (Cass), fips:29047 (Clay), fips:29145 (Newton), fips:29165 (Platte): source changed from NYT to USAFacts. Cases and deaths are pretty much unchanged.
fips:29097 (Jasper) changed source and counts increased a lot (cases 9.5k to 15.6k). It looks like USAFacts added all the city of Joplin counts to this county.
fips:29095 (Jackson) changed source and cases and deaths slightly more than doubled. I'm guessing USAFacts added all the Kansas City counts to this county.