This is a website that lists the online streams of your local fire/ems/sheriff/police emergency radio channels. Just drill down to your state and local area to find the live stream and look to the left where it says "live audio feeds" is where the live feeds are. It's pretty interesting to listen to it while surfing the web.
I told a fiend about the website, and the fact that the maps have green areas on some of the counties confused him. He thought that only green counties has streams, but the green just means that a stream was recently added for that county. Chances are your county and area will be on here.