Abstract: Abstract: The Bureau of the Census Urbanized Area Boundaries data set contains boundary information for urban areas with a population greater than 50,000. The data set includes boundaries for urban areas in all 50 states, the District of Columbia, and Puerto Rico. A UA may contain both place and nonplace territory. The U.S. Census Bureau delineates UAs to provide a better separation of urban and rural territory, population, and housing in the vicinity of large places. At least 35,000 people in a UA must live in an area that is not part of a military reservation.
Purpose: Purpose: The data provide users with information about the locations, names, and size of urban areas. The data are used primarily for national planning applications.
| Field Number | Attribute | Description | Data Type |
| 0 | FID | Internal feature number. | Long Integer representing an object identifier |
| 1 | Shape | Feature geometry. | Geometry |
| 2 | NAME | Name of the Urbanized Area | Character String |
| 3 | ST | State names that fall within that polygon | Character String |
| 4 | LSAD_ | Census identifying it is an Urbanized Area | Character String |
| 5 | UA_ | Each UA is assigned a five-digit census code in alphabetical sequence on a nationwide basis, interspersed with the codes for urban clusters (UCs), also in alphabetical sequence. | Character String |
| 6 | CNTRLAT | Centroid latitude value for the polygon expressed as a signed integer with six implied decimal places. | Double Precision Floating Point |
| 7 | CNTRLONG | Centroid longitude value for the polygon expressed as a signed integer with six implied decimal places. | Double Precision Floating Point |
| 8 | VERSION | The VERSION is a 2-digit number that will be incremented for all records in the database whenever a new release is distributed. | Character String |