Here you can see what Congressional and State legislative districts look like in Berks County.
To get started, click on the menu button in the upper left corner of the map. The map has several layers -- Congressional, State House, and State Senate districts, plus the various maps proposed as solutions to gerrymandering. The layer marked "Proposed Supreme Court US Congressional Maps" is the one likely to stick.
Play around with this. First, open up the map layer menu by clicking on the "door" icon, in the upper left corner of the map. Next, click the box next to the layer you want to see. Within each layer, you can click on a specific region to get contact information for that district. You can also zoom in/out of the map by using the scroll wheel on your mouse while holding down the CTRL key, or by pressing the "+" and "-" buttons located in the lower left corner of the map. For a full screen version, click on the button in the upper right corner of the map that looks like a picture frame. The map will open in a new Google Maps tab in your web browser.