Marianna is a borough in Washington County, Pennsylvania, United States. The population was 399 at the 2020 census. Marianna was built as a mining town for the Pittsburgh Buffalo Company in 1907 and was incorporated in 1910. At the time of its construction, the Marianna Mine was among the most modern and well equipped in the world. The to…Marianna is a borough in Washington County, Pennsylvania, United States. The population was 399 at the 2020 census. Marianna was built as a mining town for the Pittsburgh Buffalo Company in 1907 and was incorporated in 1910. At the time of its construction, the Marianna Mine was among the most modern and well equipped in the world. The town's brick homes were designed to offer indoor bathrooms, fenced yards and other amenities making living conditions very attractive for the time.
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