The "Where do developers live?" chart wasn't particularly satisfying[1], so I thought it would be interesting to look at developer population in proportion to the total population reported by the 2010 census[2].
After doing so, Washington and Massachusetts come out on top. California is #6.
Full details in this google spreadsheet: https://docs.google.com/spreadsheet/ccc?key=0Ak1kLptmHteHdEV...
Briefly:
Washington
2.15% of total population, but 5.3% of developer population. Ratio of 2.47
2.04% of total population, but 4.7% of developer population. Ratio of 2.3
California
11.91% of total population, but 14.9% of developer population. Ratio of 1.25
I threw the spreadsheet together somewhat hastily, so apologies in advance if you catch a typo.
[1]: http://xkcd.com/1138/ [2]: http://en.wikipedia.org/wiki/List_of_U.S._states_and_territo...