King County interactive voter map

Seattle is full of the worst Venn diagrams around, with overlapping levels and layers of legislative authority.

Above is a screen shot of Seattle City Council District 5 (the purple line marking the southern boarder).
You can zoom in to the precinct level for your location. A popup bubble notes which is which for you.
Here is a link to the web page.
http://www.kingcounty.gov/elections/referenceresources/electionmaps/findmydistrict.aspx