Cameron County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 4,547 and is Pennsylvania's least populous county. Its county seat is Emporium. The county was created on March 29, 1860, from parts of Clinton, Elk, McKean, and Potter Counties. It is named for Senator Simon Cameron. The county is part of the North Central Pennsylvania region of the state.

Emporium is a borough and the county seat of Cameron County in the U.S. state of Pennsylvania. It is located 100 miles (160 km) west-northwest of Williamsport. Early in the twentieth century, there were large power plants and manufacturers of radio tubes and incandescent lamps, paving brick, flour, iron, lumber, and sole leather. In 1900, 2,463 people lived in Emporium, and in 1910, the population was 2,916. By 2010, the population had dropped to 2,073, and at the 2020 census, the population was 1,961.