A Maryland mosquito control program has been operational for 20 years. This program provides for both temporary and permanent control measures with cooperative funding from state and local sources. Temporary control measures such as spraying and/or larviciding have been expanded from 82 communities in 1956 to 1485 cities, towns, developments and recreational areas in 1975. Adulticiding was done with mist sprayers and thermal foggers until 1971 when ULV ground equipment was introduced into the program. There has been limited use of aerial spraying. Adulticide applications have increased from 1.189 million acres sprayed in 1972 to 3.46 million acres sprayed in 1975. This increase was due mainly to the change in technique from mist spraying to ULV applications. Larviciding also expanded from 178 communities in 1970 to 703 communities in 1975. Abate 1G and flit MLO are the principal larvicides. Other activities of the program include: field evaluations of insecticides and equipment, surveys, light trapping, calibration of ULV equipment, and monitoring susceptibility to insecticides. Two public opinion polls indicated strong public support for the program