About Us

The Maricopa County Department of Transportation (MCDOT) plans, designs, builds, operates and maintains roadways within the County's unincorporated areas.

Transportation System


MCDOT's transportation system includes:
  • 5,216 miles of roadway
  • 435 bridges and structures
  • 160 traffic signals
  • 57,369 traffic signs

About Maricopa County


This transportation system supports Maricopa County's population of more than four million residents across 9,224 square miles. Maricopa County is the fourth most populous county in the United States and is larger than Connecticut, Delaware and Rhode Island combined. Maricopa County is administered by a County Manager who reports to the five member Board of Supervisors elected by the public. MCDOT's Director is appointed by the Board of Supervisors and leads the Department's Leadership Team. MCDOT's funding is primarily derived from Highway User Revenue Funds, as well as other federal and state sources.