Chumado

I'm applying to Ohio State and Cincinnati. My wife is active duty Air Force and we'll likely end up in Dayton, OH next summer. OSU is a good 80 miles away but I'm willing to make the drive if accepted. Cincy is my backup. 
I know Miami(OH) is very close but a coworker did her undergrad there and said there is basically no diversity in that school. Case Western isn't far either but I'm not trying to get into that much debt. 

Depending on when you emailed and what email address you used, it might be the case that you haven't given it long enough and that it's simply a busy time of year (end of semester, exams, holiday-related travel, vacation) or that the email address seemed unfamiliar if it's not university-affiliated. This is a way some people handle emails they'd prefer not to answer, but I at least usually prefer to assume the best of people until proven otherwise, so if this isn't urgent I'd just wait until after the New Year and try again. Now is not a good time to expect people to be tending to their email. 
For what it's worth, when I decline such requests, I reply to say "I'm sorry but I don't think I can write you a strong letter of reference, I suggest that you find someone who knows you better". (These would be students who attended a 150-student lecture I taught, where I had no personal contact with basically anyone who didn't attend office hours, so I couldn't say anything beyond "Stu was registered for Class and earned Grade." I wouldn't even know if they were ever physically in the lecture hall, so that would be a very weak letter that wouldn't help anyone). It takes me 2 minutes to do this, and I'm sure it relieves some anxiety for the student, even if it's not what they were hoping to hear.