OBJECTIVES: Breast cancer is the most common cancer and the second highest cause of death due to cancer among women. The US Preventive Services Task Force and the American Association of Family Physicians recommend biennial mammography screening for women aged 50-74. This study is aimed at determining factors associated with mammography screening among women in this age group. METHODS: Women (50-74 years) who participated in the Behavioral Risk Factor Surveillance System in 2013 were included (n=15,426). Weighted mammogram screening prevalence within the past two years was estimated and logistic regression was used to assess sociodemographic (age, race, marital status, education, income, healthcare coverage, employment), clinical (time since last routine check-up and pap smear, health status, history of cancer), and lifestyle (physical activity and smoking status) factors associated with mammogram screening. RESULTS: Most participants (77.4%) reported having a mammogram within the past 2 years. Factors associated with mammogram screening within the past 2 years included: older age (ORs range: 1.26-1.57), higher income (ORs range: 1.23-1.50), having a health plan (OR=2.63;95%CI=2.22-3.12), check-up within past year vs. 2 years or more (OR=5.02;95%CI=4.30-5.86), pap smear within past year vs. 5 years or more (OR=9.25;95%CI=8.01-10.69), history of cancer (OR=1.23;95%CI=1.08-1.39), being physically active (OR=1.21;95%CI=1.08-1.36), and non-smoking (OR=1.70;95%CI=1.50-1.93). Blacks were more likely to screen than whites (OR=1.69;95%CI=1.40-2.04). Those with less than high school education were less likely to screen than those who attended college (OR=0.81;95%CI=0.66-0.999). The retired were more likely to screen than those employed for wages (OR=1.31;95%CI=1.12-1.52). The unmarried were less likely to screen than the married (OR=0.79;95%CI=0.70-0.90). CONCLUSIONS: Mammogram screening prevalence was below the 81.1% recommended by Healthy People 2020. Our findings identified population subgroups that may benefit from focused interventions. Policymakers may want to consider ensuring that patients have health insurance, regular check-ups and pap smears.