More than 50 species of mosquitoes are found. Their habitats range from deserts at or below sea level, to mountain meadows at elevations of 10,000 feet or more.

Many species of mosquitoes are relatively uncommon and seldom pose a threat to the health or well-being of residents. However, several species readily attack people, and some species can transmit microbial organisms that cause human diseases such as West Nile Virus, malaria, and encephalitis.Other mosquitoes may transmit diseases to livestock or pets.