One. I met the grade criteria and it was not overcrowded so getting accepted wasn't a question. At the time, meeting the requirements got you into even most state flagships. The only people I remember applying to more than one were trying for elite level universities, very specific programs like music, engineering, etc. where they had to get directly into a department, or very specific scholarship programs.
Oh, and my school was out of state and I didn't see it, except for in the catalog, until I was dropped off. Only the students who lived nearby had visited. I actually had a leg up because I had a vague memory of going there once when my dad attended a conference there when I was in 2nd grade. I remembered it had an indoor swimming pool! It drove me nuts because none of us, parents included, could really remember any details of that trip. Now students have so much information! I had at least been on college campuses so I had something other than the movie "Animal House" to base my expectations on. Some of my friends had never even been to any college campus before heading off to school.