Before there were explorers there would be no settlement. Your question really doesn't make much sense. The question essentially asks what is the first first settlement before explorers.
In Columbus Ohio.
Marietta was the first settlement in Ohio.
The first settlement built in Ohio was in Marietta
The first American settlement in Ohio was Marietta.
Columbus was an explorer.. Columbus is in Ohio
Columbus, Ohio is named after the famous explorer, Christopher Columbus.
There is at least a small settlement of Amish in almost every state. They are mostly located in Ohio, Pennsylvania, Indiana, and Kentucky.
the battle that opened the Ohio Territory to the white settlement is the Battle of Fallen Timbers.
Cinncinnati
English
The United States created the Northwest Territory under the Northwest Ordinance of 1787. The first Settlement in Ohio was in Marietta. It was formed by the Ohio Company of Associates, which had been formed by a group of American Revolutionary War veterans.
Marietta