A reporter reads a summary of the performance and usage over the first two days of open enrollment of the Massachusetts Health Connector website The U.S. government signed up 8.2 million people for health insurance through the HealthCare.gov website, including 2.1 million people from the insurers' most sought-after demographic - those aged under 35, the top health official said on Tuesday. That compares with the 6.4 million people who signed up or were automatically enrolled at this time last year, U.S. Department of Health and Human Services Secretary Sylvia Burwell said during a conference call.