i wrote out the college name. i didn't even think of putting the code down because i had forgotten about the statistical form until i was printing out the regular app and checking to make sure i had everything.
i made my own "list" since the space they give you is so miniscule.... i wrote 1., 2., 3. where the column asks for the college code, then beneath all the info i wrote in 1. (college name), 2. (college name), 3. (college name)...
I made my own list too...I filled in the prereqs and the rest of the little grid, then appended a complete chronological list. Since I'm a non-trad, I have several schools spanning a number of years and my undergraduate degree is not from the school where I took my post-bacc classes, so I just thought it would be incredibly unclear on their form.
I did the same thing for Columbia, BTW, at their suggestion...I think whatever you can give them to make your file more understandable can probably only help. It also gave me a space to briefly explain some oddities that didn't need to be emphasized as much as they would have been by entering them in the "were there any serious problems you want to explain" section. (My school doesn't list bio lab separately from the lecture course, and doesn't assign a grade or credit to the lecture but rather to the smaller discussion group section--so it all looks odd on the transcript.)
As far as the number versus the name, definitely the name. The number is for the stats geeks, not the adcomms.