First Verizon 5G CITIES in USA (2018)

1 Ann Arbor, Michigan
Atlanta, Georgia
3 Bernardsville, Massachusetts
4 Brockton, Massachusetts
Dallas, Texas
6 Denver, Colorado
Houston, Texas
8 Miami, Florida
9 Sacramento, California
10 Seatle, Washington
11 Washington, DC

First AT&T 5G rollout Cities in USA (2018) 

3 announced, 9 to be announced later on
Atlanta, Dallas, Waco

First SPRINT 5G rollout Cities in USA (2019)

First 6 announced

Atlanta, Chicago, Dallas, Houston, LA and Washington, DC.