Among the 15 counties on our list is Maricopa County, in the southwestern swing state of Arizona. Maricopa County, home to Phoenix, is the politically competitive heart of one of the key ...

Maricopa County's oldest regional park announced it is going to break ground on a new campground with 50 developed campsites.

Maricopa County has been heralded as one of the country's fastest-growing counties for adding nearly half a million people in the past decade — but population estimates show some of Arizona's ...