Each feild office you have listed has a number of "Resident Agent" offices that you could be assigned to, not necessarily the named city. Those "RA's could be hundreds of miles from the field office, so until you know where your going in the division, it's a bit tough for you to research.
that's a valid point.
when dh and i worked for the government we were assigned to specific 'offices' but that simply identified the location of the admin. office. we might be assigned to bureau offices many miles away.
when i look at the california offices the op has listed (san francisco, los angeles and sacramento) i have to think that each of them covers a significant chunk of property (as in all of southern california, all of central, and all of northern) and have multiple branch offices.
btw-having a gov. car is not necessarily a perk-depending on how the situation is structured, it can limit you on how far you can live from an office (and it's on you to ensure you live within the allowed distance-assignments are not made to facilitate your choice of residency), can prevent you from being able to house your own private vehicals (if we opted to have one it could'nt be kept in the driveway, had to be in the garage even if that meant our private vehical had to be parked on the street)-and it can mean the employed person has to take the car into the office even on their day off , or outside their regular work hours (tech. a car may be assigned to an individual but if the need for cars is greater than an certain office can accommodate, they can require staff to have the car on property certain days a week within certain hours-i had co-workers who worked allowed flex hours but their cars had to be available other hours, so they sat around for an hour before and after their shifts to meet that mandate).