Do you have a population threshold of say 10,000 people ... or are you just looking for any incorporated city regardless of the population. Note that the "city" of Vernon, Calfornia has a population of 74.
The World Almanac and Book of Facts contains statistics on the former. I am not sure where to find the definitive number on the latter. "Cities" are created, modified, annexed, etc. somewhere almost weekly. It may be difficult to pin down.
Regardless of population, yes. Small and Large... I'm just looking for the number of recognized cities. :)