Bradford County (6th class, population 60,967) was created on February 21, 1810, from parts of Luzerne and Lycoming Counties, and named for Ontario County for the lake of the same name. On March 24, 1812, it was formally organized, and renamed for William Bradford, second Attorney General of the United States. Towanda, the county seat, was incorporated as a borough on March 5, 1828, and named for Towanda Creek.	Monroe County (5th class, population 95,709) was created on April 1,1836, from parts of Northhamton and Pike Counties and named for President James Monroe. Stroudsburg, the county seat, was incorporated as a borough on February 6,1815, and named for Jacob Stroud, a settler.
Lycoming County (5th class, population 118,710) was created on April 13, 1795, from part of Northumberland County and named for Lycoming Creek. The name is derived from the Delaware Indian word meaning "sandy or gravelly creek." Williamsport, the county seat, was laid out in 1795, incorporated as a borough on March 1, 1806, and became a city on January 15, 1866. There are various theories about the origin of the city's name: that is was so called for Judge William Hepburn; that Michael Ross named it for his own son William; or that William Ross, a boatman, used it as a port years before the town was founded.	Lackawanna County (3rd class, population 219,039) created on August 13, 1878, from part of Luzerne County, was the last county to be created. It was named for the Lackawanna River, a name meaning "stream that forks." Scranton, the county seat, was laid out in 1841, incorporated as a borough in 1856, and became a city on April 23, 1866. It was named for the Scranton family, its founders. The county adopted a home rule charter in April 1976.
Pike County (7th class, population 27,966) was created on March 26, 1814, from part of Wayne County and named for General Zebulon Pike. Milford, the county seat, was incorporated as a borough on December 25, 1874, and probably named for Milford Haven in Wales.	Sullivan County (8th class, population 6,104) was created on March 15, 1847, from part of Lycoming County and named for Senator Charles C. Sullivan, Butler District, who took an active part in procuring passage of the bill. Laporte, the county seat, was laid out in 1850 and incorporated as a borough in 1853. It was named for John La Porte, a surveyor general of Pennsylvania from 1845 to 1851.
Susquehanna County (6th class, population 40,380) was created on February 21, 1810, from part of Luzerne County and named for the Susquehanna River. It remained attached to Luzerne County until 1812. Montrose, the county seat, was laid out in 1812, and incorporated as a borough on March 19, 1824. Its name is a combination of "mont," French word for "mountain," and Rose, for Dr. R. H. Rose, a prominent citizen.	Wayne County (7th class, population 39,944) was created on March 21, 1798, from part of Northhamton County and named for General Anthony Wayne. Honesdale, the county seat after 1842, was laid out in 1827 and incorporated as a borough on January 28, 1831. It was named for Philip Hone, president of the Delaware and Hudson Canal Company. Earlier county seats included Wilsonville (1799-1802) and Bethany (1805-1841).
Wyoming County (7th class, population 28,076) was created on April 4, 1842, from part of Luzerne County and named for the Wyoming Valley. Wyoming is derived from an Indian word meaning "extensive meadows." Tunkhannock, the county seat, was incorporated as a borough on August 8, 1841, and was named for Tunkhannock Creek. The creek's name means "small stream."