11033 Background: The Supplemental Nutrition Assistance Program (SNAP) alleviates food insecurity among low-income households, which has been linked to healthcare access. Several states increased SNAP eligibility by implementing policies that eliminate asset tests and/or broaden income eligibility criteria. This study investigates the associations of SNAP policy changes on mammography use within the past year among low-income females eligible for breast cancer screening. Methods: Income-eligible females ages 40-79 years were identified from the 2006-2019 Behavioral Risk Factors Surveillance System. 28 and 22 states adopted SNAP asset test elimination and income increase policies, respectively. Difference-in-differences analyses compared changes in the percentage of mammography within one year from pre- to post-SNAP policy adoption (asset test elimination or income eligibility increase) between states that did and did not adopt policies expanding SNAP eligibility. The samples were limited to females with household income < 130% and <200% federal poverty level for analyses of asset test elimination and income eligibility increase policies, respectively, to correspond to typical eligibility criteria. Results: A total of 171,684 and 294,647 income-eligible females were included for the asset test elimination and income eligibility increase policy analyses, respectively. Overall, 58.4% reported mammography within 1 year. Adoption of asset test elimination policies was associated with a 2.11 percentage point (95% CI = 0.07 to 4.15, P=0.043) increase in mammography, particularly for non-metropolitan residents (4.14 percentage points, 95% CI = 1.07 to 7.21, P=0.008), those with household income <$25,000 (2.82 percentage points, 95% CI = 0.68 to 4.97, P=0.01), and those residing in states in the South (3.08 percentage points, 95% CI = 0.17 to 5.99, P=0.038) or in states that did not expand Medicaid under the Affordable Care Act (3.35 percentage points, 95% CI = 0.36 to 6.34, P=0.028). There was no significant association between state-level policies broadening SNAP income eligibility and mammography use (-1.07 percentage points, 95% CI = -2.64 to 0.49, P=0.18). Conclusions: This nationwide study suggests that policies eliminating the asset test for SNAP eligibility were associated with increased mammography use within one year, with the most pronounced positive impact observed in Southern states, non-expansion states, non-metropolitan areas, and households with the lowest incomes. Findings highlight the role that states policies have to both meet essential needs and promote health among vulnerable populations.