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A census block is the smallest geographic unit used by the United States Census Bureau
United States Census Bureau

The United States Census Bureau is the government agency that is responsible for the United States Census. It also gathers other national demographic and economic data....
 for tabulation of 100-percent data (data collected from all houses, rather than a sample of houses). Several blocks make up block groups
Census block group

A census block group is a geographical unit used by the United States Census Bureau which is between the census tract and the census block. It is the smallest geographical unit for which the bureau publishes sample data, i.e data which is only collected from a fraction of all households....
, which again make up census tract
Census tract

A census tract, census area, or census district is a geographic region defined for the purpose of taking a census. Usually these coincide with the Border of cities, towns or other administrative areas and several tracts commonly exist within a county....
s. There are on average about 39 blocks per block group, but there are variations. Blocks typically have a four-digit number where the first number indicates which block group the block is in, for example Block 3019 would be in block group 3.






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A census block is the smallest geographic unit used by the United States Census Bureau
United States Census Bureau

The United States Census Bureau is the government agency that is responsible for the United States Census. It also gathers other national demographic and economic data....
 for tabulation of 100-percent data (data collected from all houses, rather than a sample of houses). Several blocks make up block groups
Census block group

A census block group is a geographical unit used by the United States Census Bureau which is between the census tract and the census block. It is the smallest geographical unit for which the bureau publishes sample data, i.e data which is only collected from a fraction of all households....
, which again make up census tract
Census tract

A census tract, census area, or census district is a geographic region defined for the purpose of taking a census. Usually these coincide with the Border of cities, towns or other administrative areas and several tracts commonly exist within a county....
s. There are on average about 39 blocks per block group, but there are variations. Blocks typically have a four-digit number where the first number indicates which block group the block is in, for example Block 3019 would be in block group 3. The number of blocks in the United States
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
 including Puerto Rico
Puerto Rico

Puerto Rico , officially the Commonwealth of Puerto Rico , is a Autonomy Territories of the United States of the United States located in the northeastern Caribbean, east of the Dominican Republic and west of the Virgin Islands....
 is about 8,200,000.

Blocks are typically bounded by streets, roads or creeks. In cities a census block may correspond to a city block
City Block

City Blocks are a part of the fictional universe recounted in the Judge Dredd series that appears in the UK comic book 2000 AD ....
, but in rural areas where roads are fewer, blocks may be limited by other features. The population of a census block varies greatly, there are about 2,700,000 blocks with a population of 0, while a block with an apartment
Apartment

An apartment is a self-contained House unit that occupies only part of a Apartment building. Apartments may be owned or rented .A common alternative term for apartment is flat....
 complex may have several hundred inhabitants.

Census blocks covering the entire country were introduced with the 1990 census
United States Census, 1990

The Twenty-first United States Census, conducted by the United States Census Bureau, determined the resident population of the United States to be 248,709,873, an increase of 9.8 percent over the 226,545,805 persons Enumeration during the U.S....
. Prior to this, back to the 1940 census
United States Census, 1940

The Sixteenth United States Census, conducted by the United States Census Bureau, determined the resident population of the United States to be 132,164,569, an increase of 7.3 percent over the 1930 population of 123,202,624 persons....
, only select areas were divided into blocks.