Marietta is a city in and the county seat of Washington County, Ohio, United States. During 1788, pioneers to the Ohio Country established Marietta as the first permanent American settlement of the new United States in the Northwest Territory. Marietta is located in southeastern Ohio at the mouth of the Muskingum River at the confluence of the Ohio and Muskingum rivers. The population was 14,085 at the 2010 census. It is the second-largest by population of three principal cities of and included in the Parkersburg-Marietta-Vienna, West Virginia-Ohio Metropolitan Statistical Area. It is also... home to private, nonsectarian contemporary liberal arts Marietta College. In 1770, future U.S. president George Washington, then a surveyor, began exploring large tracts of land west of his native Virginia. During the Revolutionary War, Washington told his friend, General Rufus Putnam, of the beauty he had seen in his travels through the Ohio Valley and of his ideas for settling the territory.
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| County: | Washington County |
| State: | Ohio |
| Population: | 14,094 |
| Area: | 8.6 sq. mi. |
| Time zone: | North American Eastern Time Zone |
| Also known as: | Marietta, Ohio, West Marietta, West Marietta, Ohio |