Without addressing the specific major, the most common overlap schools with WashUStL are:
University of Chicago, Northwestern, Vanderbilt, Rice, Cornell, Duke, Stanford, & Yale according to the Fiske Guide To Colleges 2020.
Most surprising to me is that Emory University in Atlanta is not on this list. Emory University deserves a serious look based on your stated interests, in my opinion.
P.S. Not trying to start a debate, but I find the schools in post #3 above to be intriguing & very helpful. In fact, all of the posts in this thread appear to be helpful.