https://www.realclearpolitics.com/articles/2020/01/07/five_states_face_federal_lawsuit_over_inaccurate_voter_registrations__142089.html#!
Philadelphia
https://justthenews.com/politics-policy/elections/pa-26000-mail-ballots-should-have-been-rejected-year-less-1000-ultimately
Pennsylvania voter registration ends on October 19th. (Same-day voter registration - Ballotpedia)
1.6 million people in Philadelphia. 21.6% are children. 1.25 million people over 18. https://www.census.gov/quickfacts/philadelphiacountypennsylvania
701,699 people voted in Philadelphia (Philadelphia Election Results)
Minnesota
Milwaukee turnout compared to adult population and the last few elections