The one thing to remember is that not every city, even major city, is served by a municipally-owned service. Some have contracts with private ambulance services, some are covered by county agencies, and still others are covered by hospital-based services. So, 1) googling a random city and poking around their government site isn't necessarily going to get you the answer you want, and 2) you need to decide what types of agencies you ARE willing to work for.
In any event, for starters:
Boston MA (city)
Austin/Travis County TX (county)
Pittsburgh PA (city)
Portland, OR (private)
Charlotte, SC (private)
Tulsa, OK (public utility/private)
Denver, CO (hospital)
Indianapolis, IN (hospital)
New Orleans, LA (city)
Philadelphia, PA (FD- single role)
Baltimore, MD (FD- single role[i think])