City and Unincorporated Community Boundary (LA County Planning)

This layer shows all incorporated and unincorporated areas of Los Angeles County. The incorporated city boundaries are maintained by the Department of Public Works as part of the cadastral landbase, and reflects the most current annexations as of the date listed below. The unincorporated areas are maintained by the Department of Regional Planning (aka LA County Planning) for land use planning efforts. This is especially important as it relates to the County's General Plan and various area, community, and neighborhood plan updates. Please see relevant links below for more related information: Department of Regional Planning (LA County Planning) - About page. Link to official Public Works City boundary layer (shows all cities and unincorporated area, but not the individual unincorporated communities as recognized by LA County Planning). Link to official Public Works City Annexations layer and web application. Link to Countywide Statistical Areas layer (jurisdictions broken down by neighborhood boundaries for the purpose of reporting statistics) LAST UPDATED: 1/19/26 for an annexation to the City of Lancaster, from the unincorporated community of Antelope Valley.本图层涵盖洛杉矶县全部已建制区域与未建制区域（unincorporated areas）。已建制城市的边界由公共工程部（Department of Public Works）作为地籍土地基底（cadastral landbase）的组成部分进行维护，并同步反映截至下述日期的最新合并扩区（annexations）进展。未建制区域则由区域规划部（Department of Regional Planning，又称洛杉矶县规划局（LA County Planning））负责维护，用于支撑本县土地利用规划相关工作。这一点与本县总体规划及各类区域、社区、街区规划更新密切相关，因此具备重要参考价值。如需了解更多相关信息，请参阅以下官方链接：区域规划部（洛杉矶县规划局）官网简介页面；公共工程部官方城市边界图层（可显示所有城市及未建制区域，但无法展示洛杉矶县规划局认定的单个未建制社区）；公共工程部官方城市合并扩区图层及网页应用程序；全县统计区域图层（为统计报告目的按街区边界划分的管辖区域）。本图层最后更新时间：2026年1月19日，本次更新涉及将羚羊谷（Antelope Valley）未建制社区并入兰开斯特市（City of Lancaster）的区划变更。