That document a compilation of Emergency Response "team" frequencies--you might hear Auburn on one freq and Federal Way on another. They wouldn't want to use the same frequency because they might interfere with each other.
Hams aren't limited to using frequencies designated for their area--the only rule is that they can't harmfully (purposely) interfere with communications in progress. One thing you'll find out with hams is that they're self regulating. While the FCC doesn't disallow certain modes on certain frequencies, hams have developed band plans and everyone is expected to abide by them.
On the subject of repeaters--almost all repeaters are open for all to use (assuming you're licensed). Repeater owners aren't required to give everyone access, but they are responsible for anything that goes "though" their repeater. And on the geographical note--I remember once when I was in Covington I could clearly hear two guys talking on a repeater on Gold Mountain. But not all conversations take place on repeaters; most conversations on 6 meters and below are simplex (I think).
If you're interested in getting more information or getting licensed, see if there are classes near you via
this page.