U.S. President Barack Obama Chip Somodevilla | Getty Images

It's looking like a lot of people are going to have little Obamacare choice next year. One-third of the United States may have just a single insurer to pick from on Obamacare marketplaces in 2017, an analysis released Friday suggests. Seven entire states are projected to have just one carrier in 2017: Alaska, Alabama, Kansas, North Carolina, Oklahoma, South Carolina and Wyoming, according to research by the Avalere consultancy.

And more than half of the country, 55 percent, may end up having two or fewer insurers to choose from on those government-run exchanges, Avalere said. "And there may be some sub-region counties where no plans are available," a report by Avalere on its analysis found.

The findings reflect the effect of announcements this summer that three major insurers — Aetna, UnitedHealth and Humana — will sharply reduce the number of areas where they will sell individual health plans in 2017 due to financial losses on those plans, as well as the failures of most Obamacare co-op insurance plans.

The analysis relates to the number of insurers in a given "rating region," not the number of plans available. A single insurer can offer multiple plans at different price points, and at different levels of coverage.