What U.S. state capitol has a population of more than one million residents and is 144 miles south of a census-designated place (CDP) in Navajo County?
Heber-Overgaard, Arizona: Heber-Overgaard is a census-designated place (CDP) in Navajo County, Arizona, United States. Phoenix, Arizona:  With 1,615,017 people (as of 2016 ), Phoenix is the fifth most populous city nationwide, the most populous state capital in the United States, and the only state capital with a population of more than one million residents.
Phoenix