Boise State University, an idiom? (vs Idaho State University)?

Angello, Augusta, Bowie, Cleveland, Columbus, Delta, Fayetteville, Frostburg, Jackson, Kennesaw, Metropolitan, Montclair, Morgan, Norfolk, Northeastern, Northwestern, Pittsburg, Portland, Saginaw Valley, Saint Cloud, Sam Houston, Stephen F Austin, Stony Brook, Valdosta, Wayne, Weber and Winona: all State universities. No clarification as to why, just evidence it's not uncommon.