The Fifth District encompasses nearly 95 square miles and includes the County's largest metropolitan area.

The 164,000-plus population of the City of San Bernardino makes it the District's largest city.  Portions of the cities of Colton, Fontana, Highland, and Rialto along with the unincorporated communities of Bloomington, El Rancho Verde, and Muscoy compose the balance of the Fifth District.

The Fifth District is home to San Bernardino International Airport and the proposed WorldPoint International Trade Center which are located on the site of the former Norton Air Force Base.

It is also home to the Inland Valley Development Agency which is overseeing the former base conversion to commercial use.  IVDA is charged with creating jobs and is achieving much success in this area.