Mosquito control services are provided by the Northwest Mosquito Abatement District for Cook County residents and by Clarke Environmental Mosquito Management, Inc. for DuPage County residents.  Cook County residents can call the Northwest Mosquito Abatement District at (847) 537-2306 with questions regarding their program.  DuPage County residents can call Clarke Environmental Mosquito Management, Inc. at (800) 942-2555 with questions regarding their program.  Both programs utilize a balance of biological and chemical procedures that are environmentally compatible and economically feasible to reduce mosquito populations