This brief estimates the number of people newly eligible for preventive services coverage with no cost sharing, including contraception, because of the Affordable Care Act. The Affordable Care Act ensures that most insurance plans (so-called ‘non-grandfathered’ plans) provide coverage for certain preventive health services without cost sharing. Based in part on recommendations from the U.S. Preventive Services Task Force, this includes colonoscopy screening for colon cancer, Pap smears and mammograms for women, contraception, well-child visits, flu shots for all children and adults, and many more services. Estimates of people affected by these provisions are available by age, gender, race and ethnicity, and at the state-level. In addition, the brief reports findings from the IMS Institute for Healthcare Informatics of the change in the number of prescriptions for oral contraceptives with no co-pay between 2012 and 2013 and the reduction in out-of-pocket costs to women associated with this change.