The Carter Library here has positioned itself as a conference center, and Jimmuh managed to get it situated on a major highway (which he arm-twisted the state into building for him - but that's another whole story! What a debacle that turned out to be. It didn't turn out the way Jimmuh wanted, serve him right.)
So there's pretty steady traffic in and out of that place, but I don't think they get many visitors perusing Jimmuh's "legacy", such as it is. I found their website, but can't find anything about number of visitors per year - guess it's not high or they'd be bragging about it.
I did a lot of research when they were building the Clinton library and I believe that the Carter Library has something along the lines of 80,000 or visitors a year and thats for a place in Atlanta.
How the moronic city Fathers here in L.R. think they will get 150,000 to 300,000 folks a year here is beyond me.