I have hitherto found a solution to this problem.
Designate a city in the continental USA as
Make a table with all large cities in the USA. I could also just try for large cities.
Of those cities in the list, the list includes data from the continental USA.
Use a module to list all cities which match the following criteria;
cityCenter and that city is at most a fixed radius. If the distance is less than a fixed real number, add to final list.
Example: From San Francisco, some cities as far as Sacramento appear but not for Florida.
Any insights would be appreciated.