Health insurance coverage is a critical factor in making health care affordable and accessible to women. Among the 97.4 million women ages 19 to 64 residing in the U.S., most had some form of coverage in 2017. However, gaps in private sector and publicly-funded programs left a little over one in ten women uninsured. The Affordable Care Act (ACA) expanded access to coverage through a combination of Medicaid expansions, private insurance reforms, and premium tax credits. This factsheet reviews major sources of coverage for women residing in the U.S. in 2017, discusses the impact of the ACA on women’s coverage, and the coverage challenges that many women continue to face.