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L.A. County Street & Address File

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

Download the data

Description The LA County Street Center TIGER road file is a street centerline network in development by Los Angeles County to move toward a public domain street centerline and addess file.  This dataset can be used for two purposes:

  1. Geocoding addresses in LA County – this file currently geocodes > 99.5% of the addresses in our test files (5,000 out of 8 million addresses) using the County’s geocoding engines.
    1. This last statement is important – the County splits the street names and addresses differently than most geocoders.  This means that you cannot just use this dataset with the standard ESRI geocoding (US Streets) engine.  You can standardize the data to resolve this, and we will be publishing the related geocoding rules and engines along with instructions on how to use them, in the near future.  Please review the data fields to understand this information.
  2. Mapping street centerlines in LA County – note that the street types in this file are not fully updated yet.  Use with caution.
This file should NOT be used for:
  1. Routing and network analysis
  2. Jurisdiction and pavement management

History LA County has historically licensed the Thomas Brothers Street Centerline file, and over the past 10 years has made close to 50,000 changes to that file.  In order to provide better opportunities for collaboration and sharing among government entities in LA County, we have embarked upon an ambitious project to leverage the 2010 TIGER roads file as provided by the Census Bureau and upgrade it to the same spatial and attribute accuracy as the current files we use.  This effort is part of the Countywide Address Management System (click the link for details). Processes The County downloaded and evaluated the 2010 TIGER file (more information on that file, including download, is at this link).  The evaluation showed that the TIGER road file was the best candidate to serve as a starting point for our transition. Since that time, the County is moving down a path toward a complete transition to an updated version of that file.  Here are the steps that have been completed and are anticipated.

  1. Upgrade the geocoding accuracy to meet the current LA County street file licensed from Thomas Brothers.  This has been completed by the Registrar/Recorder (RRCC) – matching rate have improved dramatically. COMPLETE
  2. Develop a countywide street type code to reflect various street types we use.  We have used various sources, including the Census CFCC and MTFCC codes to develop this coding.  The final draft is here –  Final Draft of Street Type Codes for CAMS (excel file)
  3. Update the street type information to support high-quality cartography.  IN PROGRESS - we have completed an automated assignment for this, but RRCC will be manually checking all street segments in the County to confirm.
  4. Load this dataset into our currrent management system and begin continuing maintenance.


Using GIS Data on this site

GIS Data downloaded from this site generally requires GIS software to view. Click here for a list of GIS Data Viewers

GIS data available on this website is provided AS IS - please read the GIS Data Portal Terms of Use

Data Field Descriptions

• FullName – Fully concatenated Street Name for labelling
• Type – Street Type – used for labelling
• Elevation - The level of the street (0 = ground, 1 = 1st level interchange, -1 = tunnel, etc). This is not complete (do not use at this time)
• Surface - Surface Type (paved, unpaved) - not complete at this time (do not use)
• Status - Status of the road - not complete at this time (do not use)
• DrivingDir – Driving Direction
• From_L – Starting Address (left side of arc)
• From_R – Starting address (right side of arc)
• To_L – Ending address (left side of arc)
• To_R – Ending address (right side of arc)
• Parity_L – Address Parity
• Parity_R – Address Parity
• StPreDir – Street Name (Pre Direction – e.g. W Avenue Q)
• StPreMod – Street Pre-modifier
• StPreType – Street Pre-Type
• StArticle – Street Article
• StName – Street Name
• StPostType – Street Post Type
• StPostDir – Street Post Direction
• StPostMod – Street Post Modifier
• Zip_L - ZIPCode
• Zip_R - ZIPCode
• LCity_L – Legal City
• LCity_R – Legal City
• NameCat_L – Name Category (Primary, Secondary)
• NameCat_R - Name Category (Primary, Secondary)
• Accuracy – Accuracy description
• Jurisdicti – Jurisdiction of the street
• Source – Street Source (TIGER, CAMS, South Bay COG, etc)
• SourceID – Source ID – if there are errors this helps us find a street
• UpdateDate – Last Date updated

GIS Source Information
Feature Dataset Name (if applicable):
Reference Date: 2011
Accuracy: Parcel
Update Frequency: Other
Access Constraints:None

Contact Information
Steve Steinberg
Geographic Information Officer
County of Los Angeles
Internal Services Department
9150 E. Imperial Hwy, MS#3
33.916650, -118.132255
Downey, CA 90242
(562) 392-7126

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