Created on April 1, 1836, from parts of Northampton and Pike counties.

Election Returns and Oaths, Butler Borough, 1831-1839. Index to Marriage License Dockets, Females, 1885-1930. Index to Wills and Letters of Administration, 1787-1918. Index to Delayed Registrations of Births, 1941-1972. Minutes of the Board of County Commissioners, 1790-1884.

Minutes of the Board of County Commissioners, and Accounts, 1755-1783. Delayed Birth Records, 1941-1965 Births, 1876-1905. Delayed Birth Records, 1941-1968 Births, 1869-1906. West Bradford Township Taxables, 1726, 1729, 1740, 1763. Tax Records, 1758-1772, 1774-1775, 1777-1789, 1792-1849. Executors and Administrative Accounts Dockets, 1850-1966. Delayed Birth Records, 1941-1950 Births, 1869-1905. Delayed Birth Records, 1941-1943 Births, 1879-1905.

Delayed Birth Records, 1941-1949 Births, 1875-1905. Applications for Marriage Licenses and Index, 1885-1918. Index to Miscellaneous Dockets, Grantors, 1752-1936. Pennsylvania Militia, 122nd Regiment, Officer Elections, 1811. Index to Miscellaneous Dockets, Grantees, 1752-1936.

Registry of Wills and Letters of Administration, 1684-1693. List of Exemptions from Military Duty in Montgomery County, 1800-1809. Delayed Birth Records, 1941-1942, 1948-1967 Births, 1867-1905. Birth Records for Negroes and Mulattoes, 1788-1826. Records of Admissions and Discharges at the Almshouse, 1904-1913. Delayed Birth Records, 1941-1968 Births, 1870-1905. Delayed Birth Records, 1941-1981 Births, 1870-1906.