PURPOSE: Social determinants of health (SDOH) may impact cardiovascular (CV) risk in women with and without breast cancer (BC). METHODS: In 153,401 participants without prevalent CV disease from the Women's Health initiative (WHI), we assessed key SDOH factors: geographic region, rurality, insurance status, and household income. Multivariable Cox proportional hazards models were used to assess associations between SDOH factors and a composite CV outcome, which included incident myocardial infarction, incident stroke, hospitalization for heart failure, or CV death. RESULTS: In the final cohort, 10,954 (mean ± standard deviation [SD] age 62 ± 7 years) women developed BC, and 142,144 (mean age 63 ± 7 years) women remained free of BC. During a median follow-up time of 13 years, 18,148 women experienced the composite CV outcome. Rurality, low household income, and non-private insurance were associated with an increased risk of the composite CV outcome and CV death, both in women with and without BC. CONCLUSIONS: SDOH factors are associated with an increased risk of CV events among women, irrespective of BC status. These associations highlight the importance of socioeconomic factors across cardiovascular health outcomes.