The New York Times has published an interactive map that will give you the percentage of individuals without health insurance in 2015 for any county in the United states, and how these percentages have changed over the last two years. According to the New York Times map, the percentage of uninsured in the Central Ohio area as follows:

Franklin County: 9%

Delaware County: 4%

Licking County: 8%

Fairfield County: 7%

Pickaway County: 9%

Madison County: 8%

Union County: 6%

For other counties in Ohio and or any other state, check out the map and article:

http://www.nytimes.com/interactive/2015/10/31/upshot/who-still-doesnt-have-health-insurance-obamacare.html