MUNCIE, Ind. (AP) — Early signup glitches, sticker shock and a stubborn work ethic are leaving Indiana residents slow to buy health insurance through the federal health exchange.

More than 911,000 residents lack insurance, and most face a March 31 deadline to show proof they've obtained insurance to avoid a penalty under the federal health care overhaul law. But the U.S. Department of Health and Human Services says only about 30,400 residents had bought plans through the exchange through the end of December.

U.S. Census data show the largest numbers of uninsured in the state are in LaGrange and Elkhart counties. More than 25 percent of LaGrange County residents lacked insurance, while 21 percent were uninsured in Elkhart County.

Both counties have large populations of Amish, who are reluctant to use government services.