This paper describes technical details of a model to estimate the number of people without health insurance for small areas. These models were developed for a study to assess the feasibility of producing estimates suitable for the purposes of the Centers for Disease Control and Prevention’s (CDC’s) National Breast and Cervical Cancer Early Detection Program (NBCCEDP). For NBCCEDP the primary interest is in estimates of the numbers of women without health insurance within particular age groups and income groups de- fined by Income to Poverty Ratio (IPR). We produce estimates of the number uninsured by county, age group, sex, and IPR category. For a more detailed discussion of the project, see U.S. Census Bureau (2006).