Mobile mammography can increase access to preventive screening and might be effective in church-based settings. Among 1,117 women ages 50 to 80 from 45 Los Angeles County churches, 31.7 percent said they would definitely use a mobile van at church, 21.9 percent would probably use one, 28.7 percent would probably not use one, and 17.6 percent would definitely not use one. The odds of saying yes to mobile mammography were six times higher for Spanish-speaking Latinas than for whites, over two times higher for English-speaking nonwhites than for whites, five times higher for the uninsured than for those with public or private health insurance, and three times higher for women who reported no mammogram in the previous 24 months than for women who reported a mammogram. Partnering with churches to provide mobile mammography offers the potential to increase screening adherence for traditionally underscreened women.