Arizona definitely doesn't. (I arrange conference calls with folks in Arizona all the time and have to confirm in "Arizona time"
🙄) Apparently Hawaii doesn't either:
http://www.infoplease.com/spot/daylight1.html
Parts of Indiana didn't used to. Yes, parts. I went to undergrad in one of the counties that didn't, and my Mom is still confused as to whether I change my clocks or not now!
😱 However, they changed the freaking law a couple of years ago, so last year when I went back for a football game, I got there an hour later than I thought I was getting there.
😡 WTF?!! And now, some counties observe Eastern time while others observe Central time . . . what a mess!