Schools in the northeast and on the Pacific Coast are more well known for embracing diversity (ethnic, religious, sexual orientation) than schools in other areas - particularly the South and Bible belt areas. But I would be interested to hear if anyone knows of schools in the South or Midwest that make it their business to promote diversity and inclusion.
The Midwest has some highly diverse states: Michigan, Illinois, Ohio, etc. There are plenty of schools with highly diverse populations.
In the Midwest, Grinnell, Knox, Beloit, Kalamazoo, Earlham etc.
How about some research to back up this claim? Just sayin’
Macalester, Carleton, Oberlin, Michigan – really, most colleges in the northern part of the Midwest with only a few exceptions will embrace these types of diversity.
@dadof1 More or less proven out: http://www.bestcolleges.com/features/most-diverse-colleges/
Yes, many of the most diverse schools are on the coasts. But, this doesn’t mean that diversity isn’t embraced.
Some great mid-western/southern schools are also the most diverse:
-Earlham College
-Emory University
-Grinnell College
-Macalester College
-Rice University
-University of Houston
-University of Miami
-Wesleyan University
Wesleyan is in Connecticut…hardly Southern or Midwestern. But they are very diverse. 
^They may be referring to Wesleyan College, an all women’s college in Macon, GA.
I did mean Wesleyan College, sorry I mixed up the names Very small, but very diverse @circuitrider
Except it seems your researched index is purely focused on ethnic diversity and that is not what your OP asked. Religious and Sexual Orientation don't seem to be addressed. That is where many of the other recommended colleges shine.
I didn’t mean to offend anyone here. I live in the south - I have all my life - and am around an atmosphere of non-inclusion every day. It’s pervasive. I’m simply asking if there are schools that are particularly outspoken about actively supporting, encouraging and embracing all aspects of diversity. This type of atmosphere is important to my D in her college search.
In the Midwest, Earlham, Knox College, Kalamazoo College, Lawrence University (WI)), Grinnell College (Grinnell is more difficult admissions than the others) are all very diverse with respect socio-econ, racial, ethnic and LGBT communities, and inclusive and tolerant.
If you provide your D’s stats and academic interests, we can make recommendations. I wonder why you are sticking to the South & Midwest, though. Generally the northern part of the Midwest will have the schools that are most like what you describe, but almost all schools on the coasts will be like this as well.
Northwestern University is REALLY big on diversity and inclusion. Our new student body president ran on a platform almost solely focused on marginalized students.
Thanks @intparent. My daughter has a 4.12 GPA and a 30 on the ACT (which should get better). Her interests are mathematics, possibly going into engineering, but she is also interested in art and in social justice. We live in Arkansas, and she is concerned about moving too far from home, which is why we are looking more in the Central US and South. Also, she is hesitant to move to a cold climate. Not much snow to contend with in Arkansas! We probably need to push her outside her comfort zone, though.
You are going to find the schools that most appeal on the diversity front are going to be more northern and more on the coast. I’d suggest you do some visiting with her to get her more comfortable if possible. Summer isn’t the ideal time to visit because campuses are quiet, but they at least give her a feel for the campus, the neighborhood, meeting tour guides, etc. If she does want an engineering school, that changes the equation, as a lot of liberal arts colleges don’t offer engineering.
If she can hike her test scores, Swarthmore might be a reach she should look at – LAC with strong social justice and diversity leanings, and she could major in math or engineering there. It is a very intense school academically, though.
Smith is another college she should look at – it is a women’s college, but is very strong in social justice and diversity, has an engineering major, and is a very good school (but not as intense as Swarthmore). Her stats sound solid for Smith.
Not too terribly far from AR - Oberlin, Earlham, Guilford (the last two, like Swat and Haverford, are Quaker). Maybe Agnes Scott in Atlanta.
Has she looked at Hendrix? Maybe too close … but her numbers would make her a strong candidate there. When we visited with our son a few years ago, the school seemed like a place that actively embraced diversity. It was a very pleasant and lovely surprise, quite honestly …
Thanks @hsmom83. Love Hendrix! My father actually taught there for years. Sadly, my D is very intent on going to school out-of-state.