Jefferson County, WashingtonJefferson County Site Addresses. Initial data was acquired by JeffCom in 2008 and is maintained by Jefferson County on an ongoing basis. Data contains address point locations and parcel identification number.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/b3654c5205da4e05b5e63f3d04b0ebc1_19engJefferson County Washington Open Data SitePublicSite Address Points [Washington (State)--Jefferson County]Web servicesWashington (State)--Jefferson CountyWashington (State)Last Modified: 2026-01-08