Fire insurance districts are based on offical ISO guidelines as dictated by the North Carolina State Office of the Fire Marshall. Locally, the County Fire Marshall works in conjuction with the 911 center GIS Analyst to create insurance districts using Network Analyst to determine 5 mile lines. The districts then must be approved by both county commissioners and the NCSOFM. They districts are primarly used to determine which fire department will respond to an area and properly route collected fire fees to them. This layer is not a part of the ESN makeup.