The NCI procures and maintains U. S. population data for the denominators of cancer incidence and mortality rates. Annual mid-year population estimates stratified by age, gender, bridged race, and Hispanic ethnicity are available at county and census tract levels.

U.S. County Population Data

The county population estimates are produced under a collaborative arrangement between the U. S. Census Bureau and the National Center for Health Statistics with support from NCI through an interagency agreement. Slightly modified county population estimates, which only affect estimates for the state of Hawaii and hurricane Katrina-impacted counties/parishes, are used in SEER*Stat software and available for download as text files.

U.S. Census Tract Population Data

The census tract population estimates are produced by Woods & Poole Economics, Inc. (W&P) with support from NCI through a contract with methodology jointly developed by NCI, W&P, and the North American Association of Central Cancer Registries (NAACCR). Text data files and SEER*Stat databases are available for download to anyone who requests them and agrees to certain standard data use conditions.