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Proposed / Draft City Annexations and Reorganizations

This is the location of proposed (draft) city annexations (reorganizations or detachments) coming through LAFCO for the County of Los Angeles.

If you were looking for city boundaries or complete city annexation history, then click here to go to that page.

We’ll try and update this table when we are aware of new applications.  […]

Assessor Parcels – 2014 Tax Roll

Assessor Parcels from the 2014 Tax Roll are now available for download!

The Office of the Assessor (click here for their website) maintains assessment records of real and personal property in the County of Los Angeles, as well as a GIS Tax Parcel Base Map. The Assessor has recently changed its policies and […]

Public Safety Answering Point Boundaries


This dataset shows the geographic boundaries of public safety answering points, tied to correct/legal city boundaries. These geographic boundaries determine where an emergency call is routed, especially in the new e911 system. A Public Safety Answering Point (PSAP) is a state-managed local center where all 911 calls are routed. They are typically […]

USGS Faults

This dataset contains quaternary faults within 50 miles of Los Angeles County.

Click here to download the shapefile


The source of this data is the USGS Earthquake Hazards Program. The data was downloaded from the Faults and Folds Database website (click […]

Planning Areas

For planning purposes & reference within the General Plan Update.

Countywide layer which divides the County of Los Angeles into 11 Planning Areas. These area divisions were created for the LA County Dept. of Regional Planning by the GIS Section under direction from the General Plan Development Section. Reflects the most recent changes from the […]

NOAA Data Portals

I was recently made aware of a couple of sites where NOAA makes data available.

West Coast Ocean Data Portal, which hosts data related to the oceans on the west coast:







Flood Hazard data from FEMA

If you are looking for flood zone data, you can access the information from FEMA through the FEMA GeoPlatform.

Here is a link to the home page: https://hazards.fema.gov/femaportal/wps/portal/NFHLWMS. At this site you can access the FEMA webmap to download data, and there are instructions […]

LA County Land Types

Update January 2015: This update added the new San Gabriel Mountains National Monument, as well as changes to the Wilderness areas in the monument (they are now the boundaries from the US Forest Service). There are also changes to the way that the these boundaries are represented. In the past the wilderness areas were clipped out of the […]

Zoned Districts (ZD)

These districts were established when zoning was created for Los Angeles County many years ago. It was a way to break the county up into distinct areas, smaller units, for easier record keeping and organization. It is still in use to identify and keep track of those ordinances and for running queries […]

Significant Ecological Areas (SEA) – Proposed

Proposed Significant Ecological Areas

Proposed updates to the Significant Ecological Areas are based on aerial imagery and parcels.   Please note that proposed SEAs have not been officially adopted as part of the L.A. County General Plan.  For the Existing/Adopted SEAs click here.

From the Los Angeles County Draft General Plan […]

Land Use Policy (Comm/Area Plan)

This data depicts generalized land use classifications, each of which is intended to describe the dominant use characteristics within the area covered. Updated information regarding public parks, school sites, freeways, rail/transit lines, and other ownership-specific boundaries have been incorporated into this data. The actual use and intensity of development that may be […]

Specific Plans (Seven in Unincorporated Areas)

For UNINCORPORATED areas of Los Angeles County only.  A Specific Plan implements the General Plan/Community Plan and is a more detailed version of the General Plan for a focused area.  The Specific Plan articulates planning considerations and imposes regulations or controls.  Updated 9/3/14 to add Marina Del Rey and Santa Catalina Island.

The Land […]

Zoning (Unincorporated Areas Only)

This is zoning for the unincorporated areas of Los Angeles County.

For more complete information, see Title 22 (Planning and Zoning) of the Los Angeles County Code, or stop by the office of the Los Angeles County Department of […]

Town Council Areas

A town council is a democratically elected form of government for small municipalities or civil parishes. A council may serve as both the representative and executive branch. Click here for more information regarding Town Councils within the unincorporated communities of Los Angeles County. Source: individual town councils and the […]

Agricultural Opportunity Areas


This identifies areas that are presently or historically used for agricultural purposes. This information was digitized from the 1986 Antelope Valley Hazards and Resources map, and the 1980 General Plan Special Management Areas map. Source: Antelope Valley Area Plan (1986), General Plan Special Management Areas (1980).

Data can be downloaded here:

Orange County City and Special District Boundaries

I was informed that high quality boundary files for cities and special districts in Orange County are available from Orange County LAFCO’s website.

LA Times GIS Data

LA Times aggregates a number of datasets, along with an API for accessing them.

Of greatest interest to most folks is the LA Times Neighborhood dataset (click here to access), as well as the LA County Regions.

Sensitive Environmental Resource Areas (SERA)


NOTE:  This layer has been rescinded due to the update of the Santa Monica Mountains Local Coastal Program, certified by the California Coastal Commission on October 10, 2014 (a link to the resolution is here).  The new Sensitive Environmental Resource Areas and other Biological […]

Community Standards Districts (CSD)

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 […]

Rural Outdoor Lighting District (Dark Skies)

Rural Outdoor Lighting District (Dark Skies)

This project is an amendment to Title 22 of the County Code, Planning and Zoning, to establish a Rural Outdoor Lighting District for areas of unincorporated Los Angeles County. The proposed Ordinance will establish the District with regulations that will conserve energy and resources and […]

Significant Ridgelines (within CSDs)

This layer delineates ridgelines within selected CSDs whereupon restrictions are established for grading and ridgeline development.  For more information on specific CSDs where these ridgelines reside, click here.  Last updated 10/29/14 for updated Significant Ridgelines in newly certified Santa Monica Mountains Coastal Plan.

Data can be downloaded here:

Download Shapefile (.zip)


Countywide Land Use Policy (not in Comm/Area Plan)

Land Use Policy (1980 General Plan)

Referred to as the “General Plan” and encompasses the unincorporated areas (sometimes referred to as ‘islands’) not covered by a community, neighborhood or area plan.  Adopted by the Board of Supervisors on November 25, 1980.  Last Updated 10/29/14 for a small annexation to the city […]

Los Angeles County Fire Department Jurisdictional Areas


The Fire Department’s jursidictional areas. Includes: Stations-170, Battalions-22, Divisions-9 and Regions-3. There are 199 individual polygons with 30 Stations having 2 or more discrete polygons.

Click here for Shapefiles


Orange County GIS Data

Orange County now has a data portal for downloading GIS data, including parcels, road lines, etc. This looks like a very nice capability.  You have to register to access the data, but it’s a great step forward: Click here to access


The Works – Report A Problem

Los Angeles County, The Works

This award winning application for iOS and DROID enables residents of Los Angeles County to interact with the Departments of Public Works, Parks and Recreation, Public Health, and Regional Planning by

Requesting facility and trail maintenance at County parks, as well as reporting potential health and safety […]

Substructure Maps

Substructure Maps Grid

A limited number of Substructure maps in “pdf” format are available via GIS polygons representing grids containing URL links. Across various areas of Los Angeles County, paper maps were created by the Department of Public Works (DPW) and its predecessors to show underground utilities such as cable TV, gas, […]

Locations/Points of Interest (LMS Data) – July 2014 update

Current data date: July 2014

Download the data

LMS_Data_20140707  – Zipped file geodatabase. Due to the length of a number of the fields, a shapefile with its 255 character limit is unable to store all of the information regarding description, hours, phone numbers, etc. This data was extracted July 7th, 2014. This is the […]

Stormwater Catchment Areas

Abstract: This GIS layer was created to delineate catchment areas for Municipal Separate Storm Sewer System (MS4) outfalls under the Los Angeles County Flood Control District (LACFCD) jurisdiction pursuant to a 2012 National Pollutant Discharge Elimination System (NPDES) permit.


Description: The data is a compilation of storm drain hydrology studies completed by the […]

City Boundaries (This page is superseded)

We’ve moved!

The city boundary lines and polygons, along with the Los Angeles County boundary, were consolidated into the City Annexations post on this portal.


LA County Street & Address File

Starting in September 2014, the data will be uploaded every week on Sunday with the newest revisions from the CAMS system.

Important note: This is the first output of the final data structure. In the next few weeks we will begin providing weekly updates as well as a number of related symbolization files.


Proposed SEA Connectivity and Constriction (1st Draft)

This layer is the first draft of the linework depicting ‘Connectivity and Constriction’ within an SEA–as shown on the “SEA Connectivity and Constriction Map”. The SEA Connectivity and Constriction Areas Map is an implementing tool for the SEA Ordinance intended to assist in to preserving SEA sustainability. Certain development standards are imposed on new […]

LA County GIS Viewer Upgrade #1 – Googly Search!

Googly Search

Have you ever wanted the searches in our GIS applications to be more “Googly” – where as you type you get suggestions on the rest of the entry? I have dreamt about this. With the recent upgrade of our GIS Viewers to the newest versions of Essentials from Latitude Geographics (

Traffic Counts for California State Highways

An example from Orange County

While this isn’t GIS data directly, the data available at the Traffic Data Branch website can be spatially enabled to show traffic counts at the various intersections of the State Highway System.

Data available include:

Traffic Counts […]

Methane Producing Landfills

This data was created on April 30, 2012 to represent known disposal sites in Los Angeles County that may produce and emanate methane gas. The shapefile contains disposal sites within Los Angeles County that once accepted degradable refuse material. Information used to create this data was extracted from a landfill survey performed by […]

Land Records Information

Sample Tract, Parcel Maps and Records of Survey

To make land records more easily available to the general public, the Los Angeles County Department of Public Works began scanning and posting thousands of documents online, free of charge.

The best method of accessing these records is via the

NOAA merged Bathymetry & Topography DEM

NOAA’s Bathymetry website (http://ngdc.noaa.gov/mgg/bathymetry/relief.html) has an integrated DEM and Topgraphy dataset at 10 meter resolution for download.

The Santa Monica quad (found via the NGDC bathymetry website) covers all the waters of LA County and is available in two […]

Library Service Areas

This dataset contains the boundaries of the various library systems in the County of Los Angeles.

This data is used to support the library’s assignment of billing and other codes on this website: http://gis.lacounty.gov/districtlocator

Download the data

Library_Service_Areas (zipped shapefile)


Los Angeles County Sanitary Sewers

The Consolidated Sewer Maintenance District (CSMD) of Los Angeles County is administered by the County of Los Angeles Department of Public Works (DPW).

For the list of cities served, operational maps, or for more information about the CSMD, please visit the Los Angeles County Sewer Maintenance home page.

Los Angeles County Boundary

We’ve moved!

The Los Angeles County boundary, along with the city boundary lines and polygons, were consolidated into the City Annexations post on this portal.



The file is used to generate maps for planning purposes. It is also used as a basemap for GIS web applications showing the each DCFS Regional Offices and satellite sites location. The file is geocoded based on the address locations of each DCFS Regional Offices and Site location. […]

Early Historic Surveys

This layer was created for retrieving the earliest recorded surveys of original Spanish and Mexican land grants (Ranchos), along with original plats of the United States Public Lands Survey System (PLSS). The URL field points to documents (PDF) on the Land Records Information website, hosted by the Los […]

Significant Ecological Areas (SEA) – Existing/Adopted

Significant Ecological Areas (SEA)


Significant Ecological Areas (SEA) Significant Ecological Area (SEA) means an area that is determined to possess an example of biotic resources that cumulatively represent biological diversity for the purposes of protecting biotic diversity, as part of the Los Angeles County general plan or the city’s general plan. […]

Zoning Map Grid

The grid that shows the zoning maps that cover the unincorporated areas of Los Angeles County.  This grid follows alignment and numbering system as the Department of Public Works House Numbering Maps.  This was developed as part of the Zoning Map Conversion and Integration Project (ZCIP) – 2002 to 2006.

UPDATED on […]

Los Angeles County Storm Drain System

Sample Channels, Gravity Mains, Catch Basins, etc.

The Los Angeles County Storm Drain System is a geometric network model representing the storm drain infrastructure within Los Angeles County. The long term goal of this network is to seamlessly […]

Southern California Railroad Mileposts with Sheriff Reporting Districts

RD Map


Railroad mileposts used to report incidents and issues along railroad lines to public safety (law enforcement and fire). It includes LA County Sheriff Reporting District Numbers for each milepost.


This dataset was developed in 2006 to be added to Reporting District Maps for the LA County Sheriff, […]

Seismic Hazards – LA County (from State of CA)

Zones of required investigation for possible earthquake faulting, landslides, and liquefaction are delineated and distributed to cities, counties, and state construction agencies to help identify where higher building standards may be necessary for safe development.

Seismic Hazard Regulatory Hazard Zones Earthquake Fault Zone prevent buildings […]

USGS Map Services

The USGS supports a number of map services:

These allow you to view nationwide data from The National Map in your GIS software. To use these in ArcGIS – select Add Data button then choose GIS Server from the list, then “add ArcGIS Server”


To add the tiled map cache (these are background topographic […]

City Boundaries and Annexations

View City Annexations Online

Online Viewer – Use this application for searching, viewing, and downloading recorded annexation maps and legal descriptions online.

Online Mobile – Using ArcGIS Online, this map is a little more smart phone friendly.

The layers made available via […]

Coastal LIDAR data from NOAA

The California Ocean Protection Council, in partnership with USGS and NOAA Coastal Services Center, funded a LiDAR data collection effort along the California coast and San Francisco Bay, between 2009-2011. The data were made available last year through the

Fire Hazard Severity Zones


The goal of this mapping effort is to create more accurate fire hazard zone designations such that mitigation strategies are implemented in areas where hazards warrant these investments. The fire hazard zones will provide specific designation for application of defensible space and building standards consistent with known mechanisms of fire risk […]