Find And Count Text Value Within Array

I am working with imported survey data - all the questions are sorted by columns with each respondent's answer in rows. One open ended question on the survey asks people in which states they have lived, so each response cell can contain multiple text values if they have lived in multiple states (and they often respond in full sentences - as in, "we lived in Texas for three years then moved to Arizona"). How do I search all the rows in that whole answer column to count all the mentions of each state? (To complicate matters, the search cannot be case sensitive - although I guess I could do a find and replace to fix the variance).