SydCaesar

I would ask your professors about which schools they recommend, especially professors in your desired research field. They'll know best. 
I didn't know that in undergrad, so what I actually did was look through the top 100 English graduate programs in the U.S. from usnews.com. Then I looked through every single one of the programs' faculty to see which ones had faculty in my field. I then tried to see how many instructors were in my field at that university. You'll want at least two to three in your field at the university, and be careful because sometimes they could be retiring soon. Once I had the programs on my list, I extensively researched the professors I was interested in working with by looking at their scholarship. From there, I was able to narrow down my list even further.