As concerns over Zika virus have grown since 2015, the US Centers for Disease Control and Prevention has turned to local public health professionals to compile data on distribution of the two primary mosquito species capable of transmitting the virus, Aedes aegypti and Aedes albopictus. Their findings highlight both the potential widespread presence of the mosquitoes as well as gaps in local surveillance capabilities crucial to understanding the threat of Zika and other mosquito-borne diseases.