What is the fastest growing county in Ohio? on a national scale. Ohio's fastest-growing counties are located in central and southwestern Ohio. Delaware County, which borders Franklin County near Columbus, increased by 3,687 to 200,464 and Fairfield by 2,052 to 154,733. Butler County, on the Hamilton County border near Cincinnati, increased by 2,671 to 380,604, while Warren County increased by 2,406 to 228,882.

What planting zone is Youngstown OH in?

Youngstown, Ohio is located in USDA Hardiness Zone 6a. Hardiness Zone Map of Youngstown, Ohio. A hardiness zone is a geographically defined area in which a certain category of plants can grow, depending on climatic conditions, including their ability to withstand the minimum temperatures of the area.