I know 800 and 500 is because we've been in both and they have the doggy walks and poop sacks. 100 and 200 isn't because I asked about those loops when checking in and was told they weren't. Someone else can fill in the other loops.
I believe 300, 700 and 800 are pet loops, 500 is an overflow.
We were in loop 300 last week and loved it.
Tight for bigger rigs compared with other loops, but can't beat the location.
We didn't have problems with our 40 footer and our site was marked difficult
in their book.
Hope this help.
Going again at the end of March.