Arizona State University is a public metropolitan research university on five campuses across the Phoenix, Arizona, metropolitan area, and four regional learning centers throughout Arizona. The 2016 university ratings by U.S. News & World Report rank ASU No. 1 among the Most Innovative Schools in America for the second year in a row. ASU is the largest public university by enrollment in the U.S. ASU is classified as a research university with very high research activity (RU/VH) by the Carnegie Classification of Institutions of Higher Education. , ASU has been ranked among the top research universities, public and private, in the U.S. based on research output, innovation, development, research expenditures, number of awarded patents and awarded research grant proposals.