William Penn is an unincorporated community in Washington County, Texas, United States.

Eldridge House at William Penn was built by early Texas builder Robert Hallum around 1850.

The home was a hub of activity until 1903, when German immigrant Henry Muegge bought it.

German immigrants moved in before the Civil War; they eventually rose to prominence as an ethnic group.

A conference of representatives from the Texas and Missouri Lutheran Synods was hosted at William Penn in 1878 by Rev.

In 1884, William Penn's economy was entirely based on agriculture, but by 1890, it had grown to include a commercial sector and a wagonmaking industry.