Face masks must also be worn while waiting for and using public transportation, as well as taxis, ride-sharing vehicles or a private car service.
>> Coronavirus: Montgomery, Butler counties among those at very high risk of virus exposure
The order will reflect mask guidelines previously issued for employees and businesses, said DeWine.
People are not required to wear a mask if their physician advises against it, if it is prohibited by federal regulations, while communicating with someone who is hearing-impaired or when alone in a personal workspace.
Schools in those seven counties should continue to follow guidelines issued by the governor last week.
As with previous health orders, not following a mask order will be a misdemeanor violation, DeWine said.
“We’re not looking to see people arrested,” he said. “The idea is that it is the norm. This is what is needed for Ohioans to stay safe.”
The announcement after the governor unveiled a new alert system on the risk of coronavirus exposure and spread in each county last week.
The system is based off four levels based off seven data indicators. The more indicators a county meets, the higher the severity level.
As of June 30, none of the counties in Ohio met enough indicators to be in Level 4, the most severe level.
>> Dayton approves mandatory mask law, cites rapid COVID-19 spread locally
On Friday, a mask mandate went into effect in Dayton. Columbus, Cleveland, Cincinnati and Yellow Springs are among other Ohio communities that require face masks.