[4] In 1699, Thomas Browne, a Patuxent Ranger, ranged the river from the Snowden plantation to where Clarksville is sited.

[5] The area was settled with tobacco plantations such as Folly Quarter and Hobbs Regulation with slave labor.

[7] Clarksville's name originates from John R. Clark's family who immigrated from Ireland to the Howard District of Anne Arundel County in 1790.

[8] Clarksville postal office listed the population as just 65 in the 1930s with the key industry of agriculture and limestone mining.

The climate in this area is characterized by hot, humid summers and generally mild to cool winters.