Census Tract

Field Length:  6

For cases diagnosed prior to 1998, the census tract 1970/80/90 code identifies the patient's usual residence when the tumor was diagnosed. The central registry calculates this code from the patient's address at diagnosis.  This field is available only in the KCR central registry database and is considered a confidential field.  

A census tract is a small statistical subdivision of a county. Census tract codes originate from the U.S. Census Bureau, and are constructed using the patient's address. Codes are available from state health departments or the U.S. Census Bureau. Census tracts change as the population changes.

To interpret census tract, assume that the decimal point is between the fourth and fifth positions of the field. Add zeros to fill all six positions.

EXAMPLE: Census tract 409.6 would be coded 040960, and census tract 516.21 would be coded 051621.

Special codes: