Nearly 2,800 Hoosiers signed up for insurance in November, compared to 700 in October.
A recent Kaiser Health poll showed only 12 percent of the uninsured knew the exchanges were going online Monday.
Under the Affordable Care Act, employers with fifty or more employees will need to provide health insurance to those working more than 30 hours per week.
Legislators considered a state constitutional amendment on hunting and fishing and a bill creating the Indiana Career Council and debated expanding Medicaid.
Democratic lawmakers called out the GOP on Friday, saying they have to stop sidestepping the issue.