http://nationalatlas.gov/mapmaker
In the United States, there are 3,007 counties and 137 county equivalents for a total of 3,144 counties and county equivalents.
http://en.wikipedia.org/wiki/County_(United_States)
Note: See the different colors in Arizona. Arizona and Hawaii use standard time throughout the year. However: The Navajo Nation observes DST throughout its entire territory, including the portion that lies in Arizona. But the Hopi Nation, which is entirely surrounded by the Navajo Nation, does not observe DST.
http://en.wikipedia.org/wiki/Time_in_the_United_States#Daylight_saving_time
http://quickfacts.census.gov/qfd/maps/stout06.gif
Maybe, just getting all counties in CA is a good starting point.