This article evaluates the participation rates of uninsured low-income women in the CDC’s National Breast and Cervical Cancer Early Detection Program (NBCCEDP) using small area estimates of health insurance coverage. The small area model uses data from the Current Population Survey and various types of administrative records. The modeled estimates of uninsured women and the administrative records from the NBCCEDP are used separately; the two data sources are not combined. Estimates of the participation rates for these programs are analyzed at the state-level. For the Breast Cancer Early Detection Program, state participation rates were from 5.0 to 83.4 percent. In general, this article outlines a useful tool for evaluating programs that have the main criteria of eligibility as being uninsured.