How do I find my census block group?

The easiest way to search for a census tract or block group is to copy the code from another source, or from PolicyMap….

  1. Go to PolicyMap and clear any data layer.
  2. Search for a general geography your area would be located in (e.g. city, county, zip code, or actual address).
  3. Click on the location of your area.

What is a census block group number?

Census Block Numbers—Census blocks are numbered uniquely with a four-digit census block number from 0000 to 9999 within census tract, which nest within state and county. The first digit of the census block number identifies the block group.

What is the difference between census tract and block group?

Census tracts are statistical subdivisions of a county that aim to have roughly 4,000 inhabitants. A block group is a subdivision of a census tract and contains a cluster of blocks. Block groups usually have between 250 and 550 housing units. A census block is the smallest geographic census unit.

How many block groups are there in the United States?

National Geographic Tallies

Geographic Entities United States
Block Groups 217,740
Census Blocks 11,078,297
Census Tracts 73,057
Counties & Equivalents 3,143

What data is available at the census block level?

12, the U.S. Census Bureau released block-level data from the 2020 census. The data include county-level demographic information on the ethnic, racial, and age makeup of neighborhoods across the country.

How many digits are in a census tract number?

Each census tract has a basic census tract number composed of no more than four digits, and may have an optional two-digit decimal suffix. (Leading zeroes appear in electronic media products, but do not appear on the Census Bureau’s maps or in the printed reports.)

Do counties overlap?

Geographic Hierarchy For example, a line extends from states to counties because a state is comprised of many counties, and a single county can never cross a state boundary.

How often do census block groups change?

every ten years
The “down-the-middle” census geography hierarchy of census tracts → block groups → blocks is redefined every ten years.

How do I find the census tract and block group number?

Go to PolicyMap and clear any data layer. Search for a general geography your area would be located in (e.g. city, county, zip code, or actual address). Click on the location of your area. The information bubble will display a variety of geographies including the census tract and block group number.

What is the 2010 Census Block map series?

The 2010 Census Block Map Series, also referred to as the Geographic Unit (GU) block maps, is produced to support the 2010 Decennial Census data release. These maps display tabulation geography down to the census block level.

How do I search for small geographies and block groups?

You can search for small geographies including census tracts and block groups. Finding census tracts and block groups is useful on the Maps page if you want to quickly zoom in to a neighborhood or on the Tables page if you want to compare smaller geographies.

How do I search for an address in the census? does not have an address search feature available. However, you can access geographic information, such as the state, county, tract number, block number, and block group number, about a particular address using the Census Geocoder. The Geocoder can be accessed at