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The Census Bureau (http://www.census.gov/) maintains geographic boundaries for the analysis and mapping of demographic information across the United States.  Every 10 years the Census Bureau counts the population of the United States as mandated by Constitution.  The Census Bureau releases the results of this county as demographic data with geographic identifiers so that maps and analysis can be performed on the US population.

What is unique about LA County’s data?

It is clipped to the ocean boundary. Raw Census data includes a 3 mile buffer into the ocean, which impacts cartography.

IMPORTANT! It has been updated to the 2012 Census Geography Update, which merged Tracts 1370.00 and 9304.01 into the combined tract 1370.00. So the CT10 field actually reflects the 2012 Census update, which is used for all population products 2012 and later.  CENSUS_TRACTS_2010 will reflect such change and CENSUS_TRACTS_2010_ORIGINAL will not reflect such change.

How was this data created?

This data was downloaded from Census Bureau website: http://www.census.gov/cgi-bin/geo/shapefiles2010/file-download and clipped to the County Boundary using ESRI’s ArcGIS Desktop. Two new fields were added in census tract data – area in square feet and shape length in feet. This dataset has unique identifier field “GEOID10” for each record and the census tract number fields “CT10” and “LABEL” (6-digit number and 6-digit number with decimal point, respectively).

Click here to download:  CENSUS_TRACTS_1990

Click here to download:  CENSUS_TRACTS_2000

Click here to download:  CENSUS_TRACTS_2010_ORIGINAL

Click here to download:  CENSUS_TRACTS_2010

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

GIS Source Information
Database Name: eGIS_Demographic
Feature Class Name: CENSUS_TRACTS_2010
Feature Dataset Name (if applicable):
Reference Date:
Accuracy: TIGER
Update Frequency: As Needed
Access Constraints:None

Contact Information
Victor Chen

Los Angeles County | ISD | Urban Research-GIS Section

(562) 658-1799

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