That’s because these people live in states where insurers were allowed to sell bare-bones plans and exclude the sick, which has kept costs down. Under Obamacare, insurers must offer a package of essential benefits — including maternity, mental health and medications — and must cover all who apply. But more comprehensive coverage may lead to more expensive insurance plans.

Under Obamacare, all Americans must have insurance coverage starting in 2014 or face penalties of $95 or 1% of family income, whichever is greater. Enrollment in the exchanges begins October 1, with coverage kicking in in January. Plans will come in four tiers, ranging from bronze to platinum.

Some lightly regulated states, including Indiana, Ohio, Florida and South Carolina, have recently released preliminary rate information highlighting steep price increases. Unlike the blue states of California and New York, these are Republican-led states that have strongly opposed the Affordable Care Act, as Obamacare is officially known.