Are iPhone 5 and 5S the same size?

I want this cool iPhone 5 case for my 5s, and I want to know if it will fit.

Yes, they are. If you wanna buy a case, just search for iPhone 5.It's the same size!

They are the exact same size with same 4 inch display.

Yes they are the same size, but make note of the 5s's dual LED vs the 5's single LED