Here you can see what Congressional and State legislative districts look like in Berks County. (Hint: they're among the most gerrymandered, least representative in the nation.)
To get started, click on the menu button in the upper left corner of the map. The map has three layers -- Congressional, State House, and State Senate districts. Play around with it. Just click the box next to the layer you want to see. Within each layer, you can click on an area to get contact information for that district. You can also zoom in/out of the map by scrolling or by pressing the "+" and "-" buttons located in the lower right corner of the map. For a full screen version, click on the button in the upper right corner of the map.