Area code 866 is toll-free numbers, just like area codes 800, 888, 877, and 855, and future area codes 844, 833, and 822.
Toll-free codes are not associated with any particular city, state, or country. The person on the other end of the line could be anywhere in the world. 866 numbers are toll-free from landlines, but airtime charges will usually still apply for calls from a cellphone.
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.
The area code for Baybay City, Leyte, is 053. This area code is used for telephone services in the region. Baybay City is part of the Philippines, and the area code helps facilitate local and long-distance calls.
It has the area code 082.
Area code 609 is in New Jersey, including Atlantic City, Trenton, and Princeton.
The 916 area code is assigned to the city of Sacramento which resides in California, U.S.A. An interesting fact about this area code is that it was one of the original area codes developed in 1947.