There are 33 cars with 32 drivers entered in the 2013 INDY 500. Carpenter Racing has entered a second car, but Ed Carpenter hasn't named the driver for his second car, yet. With a side note NBCSPORTS.com points out there's a "T" car for every car entered. Is NBC Sports trying to say there's a potential to have 66 drivers entered?
I finally ended up finding the entry list after Googling it on NBCSPORTS.com. It took me forever to find a link to the entry list on www.indycar.com, the official web site of the INDY Car Series, and when I did find it I couldn't get it to open. I don't know why it wouldn't open, but it shouldn't be that hard to find the entry list on INDYCAR.com. As soon as you go to that page there should be a huge link marked "2013 INDY 500 Entry List".

2013 INDY 500 Entry List