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U.S. Census Bureau Statistical Areas
Area |  | Description | Defined by
Census blocks |  | A geographic area bounded by visible and/or invisible features shown on a map prepared by the U.S. Census Bureau.  A block is the smallest geographic entity for which the Census Bureau tabulates decennial census data. | Census Bureau with input from tribal officials and State Redistricting Data Program participants
Census block groups (BGs) |  | A statistical subdivision of a census tract consisting of all census blocks whose numbers begin with the same digit in a census tract. | Local partners (government agencies, regional organizations, other data users)
Census tracts |  | A small, relatively permanent statistical subdivision of a county or statistically equivalent entity, delineated for data presentation purposes.  [NAME] tract boundaries are delineated with the intention of being stable over many decades. | Local partners (government agencies, regional organizations, other data users)
Census designated places (CDPs) |  | A geographic entity with a concentration of population, housing, and commercial structures that is identifiable by name, but is not within an incorporated place. | Local partners (government agencies, regional organizations, other data users)
Census county divisions (CCDs) |  | A statistical subdivision of a county established in 22 States that do not have minor civil divisions (MCDs). | Local partners (government agencies, regional organizations, other data users)
Unorganized territories (UTs) |  | The portion of a county that is not included in a legally established Minor Civil Division (MCD) or in an incorporated place in a state in which has MCDs. | Census Bureau, after MCD disorganizes
Traffic Analysis Zones (TAZs) |  | A geographic entity consisting of one or more census blocks, block groups, or census tracts for tabulating traffic-related data, especially journey-to-work and place-of-work statistics. | State/local transportation officials
ZIP Code® tabulation area (ZCTAs) |  | An aggregation of census blocks that approximates the delivery area for a U.S. Postal Service 5-digit or 3-digit ZIP Code®. | Census Bureau
Urban Areas (UAs) |  | A geographic entity identifying a densely settled area having a population of at least 2,500.  Two types of areas identified:  urbanized areas with populations of 50,000 or more, and urban clusters with populations of at least 2,500 and less than 50,000. | Census Bureau
Combined statistical areas (CBSAs) |  | Groupings of adjacent metropolitan and/or micropolitan statistical areas that have social and economic ties as measured by commuting, but at lower levels than are found among counties in individual metropolitan or micropolitan statistical areas | Office of Management and Budget (OMB) with support from Census Bureau
Metropolitan statistical areas |  | The county or counties associated with at least one urbanized area of 50,000 or more population, plus adjacent counties having a high degree of social and economic integration with the core as measured through commuting.  May be subdivided into metropolitan divisions if specified criteria are met. | Office of Management and Budget (OMB) with support from Census Bureau
Micropolitan statistical areas |  | The county or counties associated with at least one urban cluster of 10,000 or more population, plus adjacent counties having a high degree of social and economic integration with the core as measured through commuting. | Office of Management and Budget (OMB) with support from Census Bureau
New England city and town area (NECTAs) |  | [NAME] and town-based counterpart to the county-based metropolitan and micropolitan statistical areas.  New England city and town areas are identified as either metropolitan or micropolitan (see above). | Office of Management and Budget (OMB) with support from Census Bureau
Tribal designated statistical areas (TDSAs) |  | A geographic entity that contains a concentration of people who are members of a federally recognized American Indian tribe and in which there is structured or organized tribal activity.  Delineated by federally recognized American Indian tribes that do not currently have a federally recognized reservation or off-reservation trust land. | Federally recognized American Indian tribes
State designated tribal statistical areas (SDTSAs) |  | A geographic entity that contains a concentration of people who are members of a state recognized American Indian tribe and in which there is structured or organized tribal activity.  Delineated by state recognized American Indian tribes that do not currently have a state recognized reservation or off-reservation trust land.  Known as state designated American Indian statistical areas (SDAISAs) for Census 2000 products. | State governments
[NAME] village statistical areas (ANVSAs) |  | A geographic entity that represents the permanent and/or seasonal residences for Alaska Natives located within the vicinity of a federally recognized [NAME] tribe’s historic village location.  The ANVSA should contain a majority of [NAME], especially those Alaska Natives who are members of the defining tribe. | Federally recognized [NAME] village governments, non-profit [NAME] regional association
Oklahoma tribal statistical areas (OTSAs) |  | A geographic entity delineated in consultation with federally recognized American Indian tribes in Oklahoma that once had a reservation in that state, generally encompassing an area that conforms to a tribe’s former reservation. | Federally recognized American Indian tribes in Oklahoma
Tribal subdivisions |  | Administrative subdivisions of an Oklahoma tribal statistical areas (OTSA). | American Indian tribes
Public use microdata areas (PUMAs) |  | A geographic entity for which the U.S. Census Bureau provides specially selected extracts of raw information from a small sample of long-form census records that are screened to protect confidentiality of census records. | State Data Centers
Census divisions |  | A grouping of States and the District of Columbia, established by the U.S. Census Bureau for the presentation of census data.  The divisions are nine subdivisions of the four census regions. | Census Bureau
Census regions |  | A grouping of States and the District of Columbia, established by the U.S. Census Bureau for the presentation of census data.  Each region is divided into two or three census divisions. | Census Bureau