It became the county seat in 1876, when the administrative center of Mahoning County was moved from neighboring Canfield.The discovery of coal by the community in the early 19th century paved the way for the Youngstown area's inclusion on the network of the famed Erie Canal.

Youngstown is a city in and the county seat of Mahoning County in the U. state of Ohio, with small portions extending into Trumbull County.

According to the 2010 Census, Youngstown had a city proper population of 66,982, while the Youngstown-Warren-Boardman, OH-PA Metropolitan Statistical Area it anchors contained 565,773 people in Mahoning and Trumbull counties in Ohio, and Mercer County in Pennsylvania.

Further, a nonprofit organization called Wick Neighbors is planning a $250 million New Urbanest, revitalization of Smoky Hollow, a former ethnic neighborhood that borders the downtown and university campus.

The neighborhood will eventually comprise about 400 residential units, university student housing, retail space, and a central park. New construction has dovetailed with efforts to cultivate business growth.

The Pennsylvania and Ohio Canal Company was organized in 1835, and the canal was completed in 1840.

Local industrialist David Tod, who was later Ohio governor during the Civil War, persuaded Lake Erie steamboat owners that coal mined in the Mahoning Valley could fuel their vessels if canal transportation were available between Youngstown and Cleveland.The arrival of the railroad in 1856 smoothed the path for further economic growth.Youngstown's industrial development changed the face of the Mahoning Valley.The community's burgeoning coal industry drew hundreds of immigrants from Wales, Germany, and Ireland.With the establishment of steel mills in the late 19th century, Youngstown became a popular destination for immigrants from Eastern Europe, Italy, and Greece.Recent additions include the George Voinovich Government Center and state and federal courthouses: the Seventh District Court of Appeals and the Nathaniel R. Today, the site features a blend of senior housing, rental townhouses and for-sale single-family homes.