Mercer County, Ohio
| Mercer County, Ohio | ||
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Mercer County courthouse
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 Location in the U.S. state of Ohio |
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 Ohio's location in the U.S. |
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| Founded | January 2, 1824 | |
| Named for | Hugh Mercer | |
| Seat | Celina | |
| Largest city | Celina | |
| Area | ||
| • Total | 473 sq mi (1,225 km2) | |
| • Land | 462 sq mi (1,197 km2) | |
| • Water | 11 sq mi (28 km2), 2.3% | |
| Population | ||
| • (2010) | 40,814 | |
| • Density | 88/sq mi (34/km²) | |
| Congressional districts | 4th, 5th, 8th | |
| Time zone | Eastern: UTC-5/-4 | |
| Website | www |
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Mercer County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 40,814. Its county seat is Celina. The county was created in 1820 and later organized in 1824. It is named for Hugh Mercer, an officer in the American Revolutionary War.
Mercer County comprises the Celina, OH Micropolitan Statistical Area, which is also included in the Lima-Van Wert-Celina, OH Combined Statistical Area.
Mercer County was founded in 1820 which set it apart from Darke County. Land south of the Greenville Treaty Line was still part of Darke County. An act establishing Mercer County took place on January 2, 1824. In 1837 Van Wert County was detached and the county line established is the current northern border of Mercer County. In 1839 Celina was established as the capital of Mercer County, St. Marys, Ohio was the previous capital. In 1848 the area south of the Greenville Treaty Line to the current southern county line, was attached. When Auglaize County, Ohio was formed, Mercer County's eastern border was moved 6 miles west with the exception of the area south of the Greenville Treaty line. This created the sharp point at Mercer County's south-east corner and was the last county line modification.
In the mid to late 1800s Mercer county became home to many German immigrants, most of whom became farmers in the new world. Many of these German immigrants migrated from northwestern Germany.
According to the U.S. Census Bureau, the county has a total area of 473 square miles (1,230 km2), of which 462 square miles (1,200 km2) is land and 11 square miles (28 km2) (2.3%) is water. The entire county has an elevation difference of less than 300 feet. The highest point is on the southern county line at 1071 feet above sea level. This is in proximity to the head waters for the Wabash River. The lowest point in the county is 780 feet above sea level. This point is located on the northern county line where the St. Marys River crosses over.
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