Organization of Sixty-seven Counties of Pennsylvania Began with Philadelphia, March 10, 1682

The three original counties of Pennsylvania were Philadelphia, Chester and Bucks. Some authorities claim Philadelphia was the original county and the others formed soon thereafter. These authorities give the date of the erection of Philadelphia County as March 10, 1682.

Pennsylvania historians generally agree that the three were originally erected at the same time by William Penn. Philadelphia extended toward the northwest, bounded on either side by its neighboring counties, Bucks and Chester.

Bucks was called Buckingham in a letter written by William Penn to the Society of Free Traders in 1683. At that time its northern boundary was the Kittatinny Mountains, or as far as the land might be purchased from the Indians—a very indeterminate line.

Chester County included what is now Delaware County, and all the territory, except a small portion now in Philadelphia County southwest of the Schuykill, to the extreme limits of the Province.

The first county to be formed in addition to the three original counties was Lancaster, which was taken from the territory of Chester County May 10, 1729. Its boundaries then comprised “all the province 180lying to the northward of the Octararo Creek, and westward of a line of marked trees running from the north branch of the said Octararo Creek northeasterly to the Schuylkill.” This new county was first reduced in size August 19, 1749, when York County was cut from its territory; and secondly on January 27, 1750, when the big county of Cumberland was erected from Lancaster. The limits of Cumberland then included the whole country west to the boundary of the State, or as far as the preceding Indian purchase.

Bucks County was reduced in size when Northampton County was erected from its territory, March 11, 1752, and on the same day the County of Berks was erected from Philadelphia, Bucks and Lancaster. Thus the Province of Pennsylvania continued with the eight counties until March 9, 1771, when Bedford was formed from Cumberland, the first of the many counties taken from her territory.

Northumberland County was erected March 21, 1772, from parts of Lancaster, Cumberland, Berks, Bedford and Northampton. On account of Indian purchases now reaching to the western boundaries of the State, the limits of Northumberland reached to the western and northern boundaries of the State. Her territory was so extensive that she has been known as “The Mother of Counties,” and all or parts of thirty of the present counties of Pennsylvania have been taken from the original territory of “Old Mother Northumberland.”

February 26, 1773, was erected the County of Westmoreland, whose territory was taken from Bedford County. It then included the entire southwestern section of the State. The next county to be erected was Washington, on March 28, 1781, and its territory was taken from Westmoreland, as was the County of Fayette, formed September 26, 1783. Thus, Westmoreland was considerably reduced in size within ten years from its organization.

Franklin County was erected September 9, 1784, and its territory taken from Cumberland. The following day, September 10, 1784, Montgomery County was formed from a part of Philadelphia County, the last territory to be taken from the original county.

March 4, 1785, Dauphin was cut off from Lancaster; September 25, 1786, Luzerne was erected from Northumberland, and September 20, 1787, Huntingdon was formed from Bedford.

Allegheny County was formed from Westmoreland and Washington Counties, September 24, 1788. Mifflin was formed from Cumberland and Northumberland Counties September 19, 1789.

Old Chester County lost part of its territory when Delaware County was cut from it September 26, 1789. Thus the county which comprised the most ancient settlements in Pennsylvania was now formed into the new County of Delaware, and the organization of counties in the southeastern part of the State completed.

When the County of Lycoming was cut from Northumberland, 181April 13, 1795, it was for years the largest county of the State. Four days later the County of Somerset was formed from Bedford. Green County was cut from Washington February 9, 1796, thus completing the formation of counties in the southwest corner of the State.

The next county to be formed was that of Wayne, which was set off from Northampton March 21, 1797, and formed the northeastern corner of the State.

Adams was erected from York January 22, 1800, and February 13 following Center was formed from parts of Northumberland, Lycoming, Mifflin and Huntingdon, and March 12 eight new counties—Armstrong, Beaver, Butler, Crawford, Erie, Mercer, Venango and Warren—were formed. Thus, the remaining corner of the State was organized. The counties were taken from Lycoming and Allegheny, Westmoreland furnished a part of Armstrong and Washington yielded up a portion for Beaver, but Allegheny furnished the largest amount of territory for the new counties.

Indiana was cut from Westmoreland and Lycoming, March 30, 1803.

Six new counties were erected on March 26, 1804, when Cambria, Clearfield, Jefferson, McKean, Potter and Tioga were formed. The latter four being taken from Lycoming, while Northumberland helped with Clearfield, but Cambria was cut from parts of Huntingdon, Somerset and Bedford. Bradford and Susquehanna, were formed February 21, 1810, the former from Lycoming and Luzerne and the latter from Luzerne alone.

March 11, 1811, Schuylkill was formed from Berks and Northampton. March 6, 1812, Lehigh was taken from Northampton, and February 16, 1813, Lebanon was erected from Lancaster and Dauphin. Columbia and Union were erected March 22, 1813, both being taken from Northumberland. Pike was cut from Wayne, March 26, 1814, and Perry was taken from Cumberland, March 22, 1820.

The State remained thus until Juniata was formed, March 2, 1831, from Mifflin; Monroe was taken from Northampton and Pike, April 1, 1836; Clarion was taken from Venango and Armstrong, March 11, 1839, and on June 21 following Clinton was formed from Lycoming and Center. Wyoming was erected from Luzerne, April 4, 1842, and Carbon was formed from Northampton and Monroe, March 13, 1843. April 18 following, Elk was cut from Jefferson, Clearfield and McKean.

Blair was formed February 26, 1846 from Huntingdon and Bedford; Sullivan was taken from Lycoming, March 15, 1847; Forest was formed from Jefferson and Venango, April 11, 1848; Lawrence from Beaver and Mercer, March 20, 1849; Fulton was cut from Bedford, April 19, 1850, and little Montour was taken from Columbia, May 3, of the same year.

Snyder was formed from Union March 2, 1855, and March 29, 1821860, Cameron was cut from parts of Clinton, Elk, McKean and Potter.

The last of the sixty-seven counties of Pennsylvania is Lackawanna which was cut from Luzerne, August 13, 1878.