By Reid Barton and Roger Ford.
In Boston, each puzzle header contains the name of a city, and a state and zip code that do not match that city:
Cincinatti PA 15915 Atlanta MD 21409 Miami TN 38103 Biloxi IN 47708 Raleigh WI 54880 Ithaca IL 60510 Detroit LA 70570 Galveston ID 83687 Eugene CA 90242
Sorted by given zip code, the initials of the given city names spell out CAMBRIDGE.
These are the names of the actual cities that correspond to the given zip codes:
Johnstown PA 15915 Annapolis MD 21409 Memphis TN 38103 Evansville IN 47708 Superior WI 54880 Batavia IL 60510 Opelousas LA 70570 Nampa ID 83687 Downey CA 90242
The initials of these cities, in the same order, spell JAMES BOND. Therefore the second agent is James Bond, and he is located in Cambridge.