Washington Center is an unincorporated community in west central Harrison County, in the U.S. state of Missouri.

The community is located at the intersection of Missouri routes M and D approximately 5.5 miles north of Martinsville. Big Muddy Creek flows past one mile to the west of the community.Missouri Atlas & Gazetteer, DeLorme, 1998, First edition, p. 14,

History A post office called Washington Centre was established in 1878, and remained in operation until 1904. The community lies near the center of Washington Township, hence the name.

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