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A census block is the smallest geographic unit used by the United States Census Bureau for tabulation of 100-percent data (data collected from all houses, rather than a sample of houses).

Blocks are typically bounded by streets, roads or creeks. In cities, a census block may correspond to a city block, but in rural areas where there are fewer roads, blocks may be limited by other features.

Important !

The Census Bureau mistakenly merged Census Tract 1370.00 into Tract 8002.04 in the 2010 census, and released block level data tables with that mistake. This mistake was corrected in 2011, however the data tables (SF1, etc) were not updated to reflect this change. For this file, the CT10 field and the CTCB10 fields reflect the original 2010 data, and include that mistake.

In 2012, the Census Bureau further complicated matters by merging Tract 9304.01 into Tract 1370.00. The CT12 and BG12 fields reflect this update, which is also reflected in the CENSUS_TRACTS_2010 and the CENSUS_BLOCK_GROUPS_2010 datasets.

Click here to download:  CENSUS_BLOCKS_2000

Click here to download:  CENSUS_BLOCKS_2010

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Data Field Descriptions

GIS Source Information
Database Name: eGIS_Demographic
Feature Class Name: CENSUS_BLOCKS_2010
Feature Dataset Name (if applicable):
Reference Date: 2010
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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