Weirton is a city located in the Northern Panhandle of West Virginia, United States. Most of the city is in Hancock County, with the remainder in Brooke County. As of the 2000 census, the city population was 20,411 (16,525 in Hancock County, 3,886 in Brooke County). It is a part of the Weirton-Steubenville Metropolitan Statistical area.
The small village called Holliday's Cove—which is now most of downtown Weirton—was founded in the late 18th century. (It eventually lost the apostrophe.) In 1909, Ernest T. Weir arrived from neighboring Pittsburgh and built a steel mill later known as Weirton Steel Corporation just north of Holliday's Cove. An unincorporated settlement called Weirton grew up around the mill that by 1940 was said to be the largest unincorporated city in the United States. By then Hollidays Cove and two other outlying areas, Weirton Heights and Marland Heights, which as their names suggest were on hilltops or ridges surrounding the "Weir–Cove" area, had also incorporated.
On July 1, 1947, all of these areas — Hollidays Cove, Marland Heights, Weirton Heights, and unincorporated Weirton — merged and formed the city of Weirton as it currently exists. Thomas E. Millsop, the head of the Weirton Steel division of the other Ernest T. Weir company, National Steel Corporation, was elected as the city's first mayor. The city charter was approved by voters in 1950.