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Washington County Geographical Information
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Washington County, OH, lies in Appalachian southeastern Ohio along the Ohio River.  It was the first county in the Northwest Territory in 1788 and at that time stretched from the Ohio River in the south to Lake Erie in the north.  The county seat is Marietta, where the Muskingum River flows into the Ohio.  The county's other city is Belpre.  The current 22 townships are Adams, Aurelius, Barlow, Belpre, Decatur, Dunham, Fairfield, Fearing, Grandview, Independence, Lawrence, Liberty, Ludlow, Marietta, Muskingum, Newport, Palmer, Salem, Warren, Waterford, Watertown, and Wesley.  Former townships include, among others, Harmar, Middletown, Jolly, Newton, Plainfield, Roxbury, Tuskarora, Union, and Wooster.

Washington County, OH, is bordered on the west by Athens County, on the northwest by Morgan County, on the north by Noble County, and on the northeast by Monroe County.  Across the Ohio River it is bordered on the south mostly by Wood County, West Virginia, and slightly by Pleasants County, West Virginia, to the east.

The Ohio, Muskingum, and Little Hocking Rivers, forests, coal mines, farming bottoms, hilly livestock grazing areas, and petroleum have supported many of Washington County's occupations.  

Non-native settlers included Yankee merchants and craftsmen from New England who were the first settlers in Marietta. There were also English farmers in Aurelius Township, German farmers in Fearing and Salem Townships and laborers in Marietta; Scottish sheep farmers in Barlow and Warren Townships, Irish farmers in Ludlow Township and railroad workers in Marietta; Jewish merchants and professionals in Marietta, African-American farmers and laborers in Decatur, Fairfield, and  Wesley Townships; and Belgian glass workers in Marietta have all contributed to the economy of Washington County, Ohio.

The county census was 61,788 in 2010 and it is 640 square miles in size. See more data about the county at Data USA: https://datausa.io/profile/geo/washington-county-oh

Hydrologic Atlas of Ohio
See the taps: Precipitation, Temperature, Streamflow, Water Loss, and Evaporation.


Maps of Ohio and Washington County, Ohio

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Interactive Historical Ohio County Boundaries Scroll down page

1785 map of Northwest Territory (northwest of the Ohio River)

1785 MapThe Old Seven Ranges

1804 Ohio Atlas Map

1814 Ohio Atlas Map

1822 Map of Ohio from LeSage's Atlas

1836 Map of Ohio from New Universal Atlas

1845 Ohio Atlas Map

1858 Lorey map of Washington County, Ohio

1866 Ohio Atlas Map

1871 Map of the Marietta and Pittsburgh Railroad

1873 Guide Map to Ohio

1785 Lake's Atlas Map of Washington County
Index to the 1785 map (PDF document)

1877 map of Marietta and Harmar, Ohio (may require turning off popup blocker)

1877 maps of Ohio River and Ohio River towns

1895 Sanborn Fire Insurance Maps from Ohio (You will need a current Ohio library card number (OPLIN)

Beverly1895 Sanborn Fire Insurance Map (Library of Congress)

1914 Map of Washington County, Ohio

1928 Marietta Chamber of Commerce Map

Current Road Map of Washington County, Ohio (ODOT)

Current Water Resource Map of Washington & Morgan Counties, Ohio (ODNR)

Current Ohio Mines (ODNR)

The above links are provided as a public service.
Each Web site is responsible for its own content.

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