Google maps allow for the creation of complex polygons and with the addition of cartographic boundary files
available from the US Census Bureau you can create detailed shapes of all 437 congressional voting districts within the United States.
Listed within the drop-down menus below are all of the congressional voting districts for all 50 states plus DC and Puerto Rico.
Click on any one of them and a new window will open with a basic map with all of the boundaries for that district
You can use these examples to create your own district maps or combine them to display several on a single map.
However, because of the amount of points it take to create a single polygon you may find that combing too many will take quite a bit of
time for the PC to render the map. The cartographic boundary files from the 2000 Census are available from the US Census Bureau at the following location.