This data layer represents 911 Public Safety Answering Point (PSAP) service area boundaries in Jefferson County, Wisconsin in 2019. According to the National Emergency Number Association (NENA), a Public Safety Answering Point (PSAP) is a facility equipped and staffed to recieve 9-1-1 calls. The service area is the geographic area within which a 911 call is placed using a landline is answered at the associated PSAP. [This polygon shapefile represents boundaries of the 72 counties in Wisconsin. The data is derived from 1:24,000-scale sources.]