Although one might associate the name "West Frankfort" with the city "Frankfurt" in Germany, or Frankfort in Kentucky, the truth is far more local. Around 1810, early Tennessee settler Francis ("Frank") Jordan and his seven brothers began the construction of a fort atop a hill in present-day Franklin County. Completed in 1811, the fort was named "Frank's Fort," in Jordan's honor.
The name Frankfort is from a French trapper's hutte built on the hill long before the arrival of the Jordan brothers.
Frank's Fort was built in today's Williamson County, Ill., near Corinth. A few miles to the east, Francis' brother, Thomas Jordan, built "Jordan's Fort" in Cave Township, Franklin County, Ill., near the town of Thompsonville.
The construction of these forts was in response to the danger of attack during Tecumseh's War, which culminated in the Battle of Tippecanoe in 1811. Then-governor of the Illinois Territory, Ninian Edwards, actively encouraged the construction of these forts and offered the services of the Saline Militia in their erection. Thus, both Jordan family forts were built with the help of the Illinois Militia for safety of the civilians.
Since the Shawnee Trail, an important trading route linking Kaskaskia, Illinois and Old Shawneetown, Illinois, ran along the high ground in the vicinity of the fort, this area became an attractive destination for settlers in search of cheap land made available by the recently passed Bit Act of 1850. The resulting settlement took the name of the nearby fort, which was subsequently shortened to "Frankfort." Frankfort grew quickly during this period, with its population rivaling that of Chicago, at the time.
Frankfort was Franklin County's first county seat until 1839, when the lower half of the county was declared as Williamson County.
After railroad tracks linking Chicago, Paducah, and Memphis, were laid 4 miles (6 km) west of Frankfort, many businesses and residents migrated to the new commercial center forming near the tracks. This new community became known as West Frankfort, for its location to the west of Frankfort. The two cities eventually merged and retained the name West Frankfort.
The area of West Frankfort formerly known as Frankfort is still sometimes referred to locally as Frankfort Heights or, more commonly, simply as "The Heights", due to its higher elevation relative to the rest of the city. A post office was maintained in Frankfort Heights until its destruction by fire in 2004, making West Frankfort one of the smallest cities in the United States to have two ZIP codes (the other zip code is designated as "Frankfort Heights, Illinois").
Beginning in 1904, the Deering Coal Mine Company took Franklin County and West Frankfort from no coal production in 1900 to being the #1 coal producer in Illinois by 1917. Once the mines opened, the population increased 3,500 in seven years. By 1927, West Frankfort's population had reached 19,896. In the late 1940s, four theatres and a minor league baseball team (see below) marked the downtown area.