Atlanta, Houston, Detroit, Boston, Chicago, D.C., & Philadelphia/New Jersey - or a city nearby - appear to be close to ready to go commercial. Only Sacramento and Los Angeles are announced. This is not a firm deployment plan.
Verizon has been doing trials in eleven cities. They are running fiber and beginning to deploy in literally hundreds of other places. They will make final decisions based on the results in each city, marketing, and politics. They've publically committed to 1,000 base stations by the end of 2018, the largest mmWave deployment in the world. That would likely be enough for 3 to 10 square miles per city, but it will not be evenly distributed.
Millimeter wave performance differs enormously based on terrain, height, foliage, and even traffic. Verizon trials and early deployments are locations with different physical features.