The US Congressional Districts layer contains polygons for US Congressional Districts. The source for the information in this layer is the Los Angeles County Registrar-Recorder's Precinct Information File (PIF), The boundaries are based on the 2020 Census as provided by the California Secretary of State in 2021.Where boundaries are defined by streets, water bodies, city boundaries, or other features, those boundaries are copied to the districts layer, so that the boundaries and other layer features match perfectly.Last Update: March 2022

This web map shows the major boundary differences of Los Angeles County 2021 Supervisorial District boundaries and 2011 supervisorial district boundaries.2021 Supervisorial District boundaries was adopted on December 15, 2021. 2011 Supervisorial District boundaries was adopted on September 27, 2011.How is this data created?This data is created by intersecting 2021 Supervisorial District boundary with 2011 Supervisorial District boundary and select only the major boundary change polygons.

This layer contains the current Official Supervisorial District Boundary for the County of Los Angeles, per Assessor parcels and the Department of Public Works' City/Community boundaries.Supplemental Information: Adopted December 15, 2021 - The County of Los Angeles Citizens Redistricting Commission’s Redistricting Plan adjusting the Official Supervisorial District Boundary for the County of Los Angeles pursuant to Elections Code Sections 21530 et seq. See Resolution No. 2021-04, Resolution of the County of Los Angeles Citizens Redistricting Commission Adopting a Redistricting Plan for the Los Angeles County Supervisorial Districts pursuant to Elections Code Section 21530 et seq.and Resolution No. 2021-05, Resolution of the County of Los Angeles Citizens Redistricting Commission Adopting a Redistricting Report for the Los Angeles County Supervisorial Districts pursuant to Elections Code Section 21534, subd. (d)(3). Per Sec. 21531 of the California Elections Code, Supervisorial District boundaries in the County of Los Angeles are adjusted in the year following the year in which the decennial federal census is taken. Published in the County Code under Title 1, Chapter 1.08, are boundary descriptions for the Supervisorial Districts.Last Updated: 3/4/2022

The Los Angeles County Waterworks Districts boundary layer was created by the GIS and Mapping Unit of the Waterworks Division from the legal descriptions of the initial formations of the Districts and updated with subsequent annexations (additions to) and detachments (subtractions from) of the Districts. The boundaries are used internally for analysis and planning and are used by the general public to find the Water Utility for their property when accessing the Service Locator on the Public Works website.Click HERE to access the REST end point for Los Angeles County Waterworks District Boundary.Layer Contact Information:Los Angeles County Public WorksWaterworks DivisionJack Husted(626) 300-4774jhusted@dpw.lacounty.gov

The community standards districts are established as supplemental districts to provide a means of implementing special development standards contained in adopted neighborhood, community, area, specific and local coastal plans within the UNINCORPORATED areas of Los Angeles County, or to provide a means of addressing special problems which are unique to certain geographic areas within the unincorporated areas of Los Angeles County. For detailed development standards for each CSD, please refer to the Community Standards District portion of the Los Angeles County Code (click here).LAST UPDATED: 6/20/24 - following the Metro Area Plan update, the Subareas in the East Los Angeles, and West Athens - Westmont CSDs were modified. The Subareas in the Ea st Rancho Dominguez CSD was rescinded.NEED MORE FUNCTIONALITY? If you are looking for more layers or advanced tools and functionality, then try our suite of GIS Web Mapping Applications.

The Los Angeles County Flood Control District (District) was established in 1915 and encompasses approximately 2,758 square miles. The District operates and maintains one of the most complex systems of flood control and water conservation in the Country. The District’s current infrastructure includes 14 major dams and reservoirs, 483 miles of concrete and soft-bottom channels, 3,380 miles of underground storm drain conduits, 82,275 catch basins, 48 pump stations, 173 debris basins, 181 crib dams, 29 sediment placement sites, 27 spreading grounds, 21 low-flow diversion structures, 3 seawater barrier systems with 290 seawater barrier injection wells, 1 constructed wetland, and 1 mitigation bank area. Employees of the Los Angeles County Public Works (PW) serve as staff for the District. The District is separate from PW and funds of each entity remain in separate accounts. PW pays the District for the use of District equipment, materials and property used for County purposes. The District is empowered to carry out the objectives of the Los Angeles County Flood Control Act of 1915, California Water Code, Appendix, Chapter 28 (the Act). The objectives are to provide for the control and conservation of flood, storm and other wastewater and to protect from damage such as flood or storm waters, the harbors, waterways, public highways and property within the District. These powers are exercised by the County Board of Supervisors (Board), which acts as the governing body of the District. The duties of the Board include approving the District’s budget, determining the District’s tax rates, approving contracts, and determining when to issue bonds authorized by the voters of the District.

Zoned Districts were established when zoning was initially created for the UNINCORPORTED areas of Los Angeles County. They served to divide the County into smaller distinct units for easier record keeping and organization. Zoned Districts remain in use to identify and track records from the earliest period, and for performing queries regarding permits and ordinances adopted over time. For a list of Zoned Districts or other information regarding these districts, please refer to Title 22 of the Los Angeles County Code here.LAST UPDATED: 12/12/24 for annexation to the City of Whittier.NEED MORE FUNCTIONALITY? If you are looking for more layers or advanced tools and functionality, then try our suite of GIS Web Mapping Applications.

Please note this layer is now deprecated.The layer contains the polygons of the School District Boundaries for Los Angeles County.

Please note: There are two types of school districts. The first type is a split district - a school district that separates the elementary school districts from the middle and high school district. The second type, a unified school district, combines all three types of schools.

In this dataset each unified district has its own polygon, and the split districts have a polygon for each combination of elementary and middle/high school district (users can use the District or Label fields to show either or both types of districts).Last Update: January 2012Update Frequency: As NeededContact Information:

Los Angeles County Registrar-Recorder/County ClerkGeographic Information Systems SectionFtoma@rrcc.lacounty.gov

The Community Standards Districts (CSDs) are established as supplemental districts to provide a means of implementing special development standards contained in adopted neighborhood, community, area, specific and local coastal plans within the UNINCORPORATED areas of Los Angeles County, or to provide a means of addressing special problems which are unique to certain geographic areas within the UNINCORPORATED areas of Los Angeles County. For detailed development standards for each CSD, please refer to the Community Standards District portion of the Los Angeles County Code (click here).LAST UPDATED: 6/20/24 - following the Metro Area Plan update, the following CSDs were modified: East Los Angeles, Walnut Park, West Athens - Westmont, and West Rancho Dominguez - Victoria. These CSDs were rescinded - Willowbrook and East Rancho Dominguez.NEED MORE FUNCTIONALITY? If you are looking for more layers or advanced tools and functionality, then try our suite of GIS Web Mapping Applications.

Supervisorial District Boundaries (1981) as derived from a scanned map. This layer was developed for informational and referential purposes, and for general investigation and analysis of district histories. The data may also be used for general cartographic purposes. It should not be used for legal questions.The data from was digitized from scanned and rectified County Engineer maps provided by the Department of Public Works.Click here to view and download the scanned/rectified map as a .tif file

Geospatial data about Los Angeles County LA City Council Districts (2012). Export to CAD, GIS, PDF, CSV and access via API.

Los Angeles County Public Works Landscape Maintenance District Zones. These Zones represent the special assessment boundaries for the Landscape Maintenance District Zones.

This dataset seeks to encapsulate right of way parcel information for the Los Angeles County Flood Control District(LACFCD). It contains polygons representing each parcel and attribute information information that lists the basic identification information of those parcels. There is also information on the underlying right-of-way map that the parcel polygon and attributes are based on--with a link to that map in the Land Records Information Website.This data is maintained by the Right of Way Section of the Survey/Mapping and Property Management Division of the Department of Public Works. It is drawn to be coincident with the county's landbase linework and thus may not be a true representation of a parcel's boundary. It is intended to be used as a general information tool and is not survey quality.Field ListFacilityThe primary name of the facility this parcel belongs to. Typically the name of the river, stream, or drainage project it is a part of.Parcel_NoThe identification number for a particular parcel within a facility. The parcel number is not necessarilly unique.EstateThe type of estate that the LACFCD holds over a particular parcel. This field will list the following attributes:Fee: The LACFCD owns the parcel outright.Easement: The LACFCD holds an easement over this parcel. The type of easement is not listed in this data. It can usually be found in the linked right of way map or by contacting Right of Way Engineering.Quitclaim: This is a parcel which the LACFCD owned or had an easement over at some point but has now sold, released its claim, or transferred its right of way to another party.Other: This is a catch-all attribute for any sort of relationship that does not fit in the other estate types. One example of this is a permit that grants temporary rights to the LACFCD. Map_NoThe primary right of way map that shows a parcel and that served as the basis for the information shown in the dataset. These maps are maintained and are considered to take precedence over the data in this dataset.MapLinkThis is a link to a a scan of the map, if one exists, listed in the "Map_No" field. These are color scans found in the LA County's Land Records Information Website. Update Schedule: QuarterlyContact Info:Diego Veradvera@dpw.lacounty.gov(626) 458-7368Right of Way SectionSurvey/Mapping and Property Management DivisionDepartment of Public Works

The Provisional Health District Layer contains Department of Public Health Health Districts as of 2011, which are aggregates of 2010 Census Tracts. Furthermore, Health Districts comprise the building blocks of Los Angeles County Service Planning Areas (SPAs). The Provisional Health Districts were created by the Los Angeles County Department of Public Health for planning purposes and are subject to change.

© Los Angeles County

These polygons represent areas maintained by the landscape maintenance districts. Areas include medians, areas adjacent to roadways, and engineered slopes behind properties.

*IMPORTANT*Although this is a shared hosted feature layer, it should ONLY be used internally for LA County PW projects and analysis using Business Analyst or AGOL.For public facing projects, use this authoritative layer for CSAs and current Supervisorial Districts instead.**ALL ADMINS - DO NOT CHANGE THE DATA IN THIS LAYER WITHOUT CONTACTING THE OWNER FIRST!**The CSA project was developed to provide a common geographic boundary for reporting departmental statistics for unincorporated areas to the Board of Supervisors.The CIO and the LA County Enterprise GIS group worked with the Los Angeles County Board of Supervisors Unincorporated Area and Field Deputies to establish names that reflect as best as possible the general name preferences of residents and historical names of areas. A Board Motion established these area names as “Board Approved.” CSAs differ from the more informal “Community” geographies because:They are primarily focused on broad statistics and reporting, not mapping of communities.They represent board approved geographies comprised of Census block groups split by cities.They must cover the entire unincorporated CountyThere can be no holes or overlapping areasThe CSAs originally were created using Census Block Groups split by cities (e.g., "Split Block Groups") as a geographic building block. These boundaries are subsequently updated as needed based on city's annexation/deannexation records. In the City of Los Angeles, the LA City Neighborhood file was overlaid on the Block Groups and boundaries assigned using the centroid of the block group - therefore, while the names of the CSAs in LA City match the neighborhood file, the boundaries are not the same.Additionally, CSAs are to be named according to the following recommended naming conventions:All names will be assumed to begin with “Unincorporated” (e.g., Unincorporated El Camino Village) for the unincorporated areas. They will not be part of the Statistical Geography Name (so the name of the Statistical Area would be “El Camino Village”).Names will not contain “Island” – beginning each name with “Unincorporated” will distinguish an area from any surrounding cities. There may be one or more exceptions for certain small areas (e.g., “Bandini Islands”)A forward slash implies an undetermined boundary between two areas within a statistical geography (e.g. Westfield/Academy Hills or View Park/Windsor Hills)Certain established names may include hyphens (e.g., Florence-Firestone)Aliases may be defined in parentheses (e.g., Unincorporated Long Beach (Bonner/Carson Park))

This layer contains the polygons of the 2011 California State Senate District for the county of Los Angeles. Last Update: November 2011Update Frequency: As NeededContact Information:

Los Angeles County Registrar-Recorder/County ClerkGeographic Information Systems SectionEsalazar@rrcc.lacounty.gov

The State Senate Districts layer contains polygons for California State Senate Districts. The source for the information in this layer is the Los Angeles Registrar/Recorder's Precinct Information File (PIF), which is designed to match the Thomas Brothers TRNL (road network) layer.

Where boundaries are defined by streets, water, city boundaries, or other features, those arc segments are copied to the districts layer, so that the boundaries and other layer features match perfectly.

This data is not for tax collection purposes. It is used to expedite Road Maintenance operations. This data is typically updated to coincide with city annexations.

LA City Council Districts (2012)