I like data!
Nice to see the Champ map and the map of all teams in the World and in Seattle.
My first thought is to area/color code the regions population so we can see the relationship between population density and teams. Another filter could be the location of First corporate sponsors and the third filter could be manufacturing activity. My guess is that most teams are located near cities, sponsors and manufacturing activity.
It would also be interesting to learn more about how teams are formed and sustained that exist outside of these locations.
As Bob from team 1983 mentioned, there are some errors in your data.
My team is not listed. We are on the east side of Seattle (15 miles east). Also missing are a number of teams in the Bellevue area and another team in my school district (Liberty HS).
Maybe cross reference the FIRST ranking docs. Here is one for the Pacific NW.
http://frc-districtrankings.firstinspires.org/2016/PNW
Dave
Skyline Robotics
Mentor 2976