Census Block Groups
Census Block Groups Census block groups are statistical areas smaller than a census tract but larger than a block group. Each census tract contains a cluster of block groups, and each block group describes areas with 600 to 3,000 residents. Block groups are made up of even smaller statistical areas called blocks. For example, within its 2,346 census tracts, Los Angeles County has 6,425 block groups. This map of Los Angeles County tract number 1047.01 shows the three block groups that it contains.
Census Tracts
Census Tracts Census tracts are statistical areas that are smaller than a county but larger than a census block group. They describe areas containing between 1,200 and 8,000 people
and typically have boundaries that follow identifiable geographic features. The U.S. Census Bureau tries to keep tract geographies consistent to compare locations over time, but tract definitions can change with population changes. As an example, Los Angeles County has 2,346 census tracts. This census tract-level map of Los Angeles County highlights those tracts where households were the hardest to count in the 2020 decennial census.
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