Tyler County is located in the northwest section of West Virginia along the Ohio River.
The county was settled around 1792 and was created from Ohio County in 1814. The county is named in honor of John Tyler, a governor of Virginia.
A huge oil boom caused a population increase in the late 1800s. The county's population is now about half what it was in 1900.
Middlebourne is the county seat and was established in 1813.
Sistersville, the largest community in the county, is named in honor of two sisters, Sarah and Delilah Wells.
Source: The 55 West Virginias: A guide to the State's Counties, by E. Lee North, Published by The West Virginia University Press.
Land in square miles: 258
Number of people per square mile: 37.2