There's only one county in the US that doesn't have an insurer on the Obamacare exchanges

One county in Ohio is the only in the US at risk of being without a health insurer for 2018 on the exchanges established by the Affordable Care Act.

After Wisconsin said on Monday that all of its counties would have insurers for 2018, Paulding County in northwest Ohio became the only county in the country that doesn't have a health plan available through the exchanges.

The county covers just 334 enrollees.

It's a positive development for Obamacare, the law formally known as the Affordable Care Act, at a time when the future stability of the law remains uncertain. On August 15, the insurer Centene stepped in and covered 14 rural Nevada counties that had previously not had insurers for 2018. 

Larry Levitt, a senior vice president at the Kaiser Family Foundation, a nonpartisan health-policy think tank, tweeted out a timelapse of how the number of counties that were at risk of not having insurance plans on the marketplace in 2018 has changed over time. 

Health insurers have until late September to finalize their coverage areas.