Final answer:
An exact number of U.S. cities containing or ending with the word 'city' can't be provided without a comprehensive list. Known examples include New York City and Kansas City, which contain 'city', and Yuba City and Union City, which end with 'city'.
Step-by-step explanation:
It's not possible to give an exact number of cities in the United States that contain or end with the word 'city' without a current and comprehensive list of all U.S. city names.
However, some well-known examples of cities that contain 'city' within the name are New York City and Kansas City. Examples of cities that end with the word 'city' include Yuba City and Union City.
Compiling a list would require a thorough examination of the names of all incorporated places including cities, towns, and villages in the United States.