The number is up to 27 this year if you count practice squad:
https://www.gwinnettdailypost.com/sports/gwinnett-alumni-on-nfl-football-rosters/collection_b6007f9e-cf7a-11e9-8778-f33f19b787ec.html
Either way, it makes more sense to look at epicenters of talent rather than city names. If I were...