The figures were released Monday by the U.S. Department of Health and Human Services.
More than 2 million people have signed up nationally.
Most of those signing up for coverage in Arizona are older. The department says that 36 percent of those that have chosen plans are between ages 55 and 64.
At 53 percent, slightly more women have chosen plans than men in Arizona. Sixty-eight percent are getting financial help to pay their monthly premium.