Is the iPhone 5, 5s and 5c the same size?

I love phone cases but I always just see "Case for iPhone 5" at the stores. I was told that the 5, 5s and 5c are all the same size because 5 is the "model number" for lack of better words. If I have a 5c can I use a case that is for 5 and 5s? Thank you.
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