Happy New Year Sue ,
You can call your local PD, SO, and Highway Patrol (at their public numbers, not the 911 number) and ask them. They should know, at least when you're in your home area, who you're going to get. When you're roaming, I agree with the others - you'll get the dispatch (most likely PD) for whatever locality is closest to the nearest cell tower to your phone.

If I remember right, you're in the NW area. If you're in a small town, you can go down to the PD or SO (SO is almost always more friendly - they're always kind of down-home and back-woodsy people) and speak directly to the dispatchers. They'll probably let you drive away a few miles, make a 911 call, and answer it without giving you any crap. You know.... just to test it.

If all else fails, you can ask tracfone.com