Area code 731 is in that famous part of North Carolina called "western Tennessee." It includes Jackson, TN, but not Memphis.
Redwood City is in area code 650.
Missouri City is in area code 281, with overlay code 832. There may also be some Missouri City numbers in area code 713.
Rockwell City, Iowa, is in area code 712.
Traverse City, Michigan, is in area code 231.
The area code for the whole Davao City is 082.
Johnson City, NY, is in area code 607.
The area code 479 is for the state of Arkansas. A zip code is for a city or part of a city. By area code alone you cannot determine a zip code.
Gotham City is a fictional place, and thus has no actual area code.
It has the area code 082.
866 is a toll free number code
Area code 609 is in New Jersey, including Atlantic City, Trenton, and Princeton.