Created on September 10, 1784, from a part of Philadelphia County.

Tax Records Borough and City of Erie, 1850-1857, 1867, 1869-1870. Index to Letters of Administration and Administration Bonds, 1752-1915. Index to Marriage License Dockets, Male, 1885-1936. Jurors Lists, Grand and Traverse, 1806-1856, undated. Delayed Birth Records, 1941-1959, Births 1869-1906. Court of Common Pleas Accounts Auditors Reports, 1850-1960.

Registration of Marriages, 1852-1854, 1873, with index. Marriage Records and Index to Marriage Records, 1852-1855. Minutes of the Board of County Commissioners, 1786-1879.

Tax Records of Adams County, 1800-1959, and York County, 1798-1800. Minutes of the Court of Oyer and Terminer, 1876-1878. Marriage Records From Various Unofficial Sources, 1779-1866. Counties maintain hospitals and homes for the aged. Minutes of the Board of County Commissioners, 1873-1959. Delayed Birth Records, 1941-1970 Births, 1869-1906.

Minutes of the Directors of the Poor and House of Employment, 1798-1866. Minutes of the Board of County Commissioners, 1843-1960. Tax Duplicates, East Connoquenessing Township, 1844-1858. Delayed Birth Records, 1941-1969 Births, 1863-1906. Military Discharges, Civil War, 1862-1865, 1868-1902. Delayed Birth Records, 1941-1963, 1965, 1967 Births, 1879-1906. Miscellaneous Civil and Criminal Records, 1843-1932. Delayed Birth Records, 1941-1968 Births, 1864-1906. Minutes of the Board of County Commissioners, 1740-1746, 1756-1918.

Minutes of the Board of County Commissioners, 1882-1887. Naturalization Records Files and Index, 1807-1969. Index to Marriage License Dockets, Males, 1885-1930. Counties may support local libraries and community colleges. Court of Quarter Sessions Criminal Files, 1782-1827.