Note: Federal regulations established a 45-day open enrollment period for 2018 coverage beginning on November 1, 2017 and ending on December 15, 2017. For 2019 coverage, the open enrollment window will again last 45 days, beginning on November 1, 2018 and ending on December 15, 2018. The 11 states (and the District of Columbia) that operate their own ACA marketplaces and use their own enrollment platforms have authority to modify the federally-specified enrollment dates, including by lengthening the duration of the sign-up period. By contrast, the 39 states that use Healthcare.gov for enrollment do not have such authority. This graphic identifies those states that extended the length of the 2018 open enrollment period beyond the 45-day federal default, or that plan to extend the duration of the 2019 enrollment period. While, as a formal matter, some of these states have provided for an extension by establishing a broadly available special enrollment period beginning on the day following the end of the federal default open enrollment window, the table identifies those states that, as a matter of practice, offer a continuous, broadly available enrollment period for next-year coverage than is longer than 45 days.