More than 9.5 million individuals signed up for health insurance plans through the federal and state exchanges during the first nine weeks of the 2015 open enrollment season, the U.S. Department of Health and Human Services reported Tuesday.

Of those 9.54 million individuals who selected exchange coverage from the Nov. 15 start of the 2015 open enrollment season, about 75%, or 7.16 million, as of Jan. 16 did so in the 37 states in which health plans are offered through the federal exchange. In addition, 2.38 million people chose — generally through Jan. 17 — plans in the 14 states, including the District of Columbia, with their own exchanges.

“We're pleased that, nationwide, 9.5 million people are signed up for” exchange coverage, HHS Secretary Sylvia Burwell said in a statement.

The selection of plans by more than 9.5 million individuals is more than triple compared with the roughly 3 million Americans who chose plans as of the same time last year, the first year the exchanges — created by the health care reform law — opened.

Of states with their own exchanges, California by far had the highest number of individuals who have selected a plan during the 2015 open enrollment season with 1,200,427. It was followed by New York with 357,241; Colorado, 122,381; and the state of Washington, 117,705. At the other end of the spectrum, Hawaii had the fewest number of individuals who selected health plans at 6,868, followed by the District of Columbia, 17,485; Vermont, 26,009; and Rhode Island, 26,108.

Of states in which the federal government runs the exchanges, Florida, had the most signups for coverage over the last nine weeks with 1,270,994, followed by Texas, 918,890; North Carolina, 458,676; Georgia, 425,927; and Pennsylvania, 422,283. At the other end, North Dakota had the fewest number of individuals who selected plans at 15,606, followed by Alaska, 16,724; Wyoming, 17,821; and South Dakota, 18,040.

The HHS figures underscore the potential impact of an upcoming U.S. Supreme Court decision on the legality of premium subsidies to enrollees obtaining coverage in the federal exchange.

Eighty-seven percent of the 7.1 million individuals who have selected a plan in the federal exchange were eligible for federal premium subsidies. Those subsidies would be lost if the high court rules that the subsidies are available only for state exchanges.