The Illinois Association of County Engineers is the collective forum of the 102 appointed county officials in direct charge of county highway transportation in Illinois. Since 1914, the Association has served to provide for the exchange of ideas and information aimed at improving the county highway engineering profession and county highway engineering services to the public.

County Engineers, as provided by Illinois law, are appointed by the various county boards and approved by the Illinois Department of Transportation (IDOT). They must be graduate, licensed professional engineers experienced in highway transportation. The County Engineer's responsibilities include the administration of the county road agency, coordination of funding for the township road agencies in the county and representation of the county's interests with IDOT. They are responsible for the construction, maintenance, and safe operation of the 16,571 miles of designated county highways in Illinois.

County Highways are roads that meet the criteria for secondary arterial highways as established by State law, having been designated by the county board and approved by the State of Illinois. Similar to state highways, county highways crisscross each of the 102 counties in the state and extend through municipalities. Several counties have chosen to identify their county highways by the pentagonal blue and gold county route marker.

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