Cemetery Deeds, 1851-1990 (Series 249)
Cemetery Records of Veterans, see Veterans
Census Rolls (New York State), 1905, 1915, 1925 (Series 19)
Charles Point Resource Recovery Facility Photograph Album, 1984 (Series 318)
Charter and Administrative Code Revision Committee Records, 1957-1961 (Series 370)
Charter Revision Committee, Board of Supervisors, 1922-1984 (bulk 1951-1969) (Series 388)
Circuit Court, 1796-1888 (gaps) (Series 257)
Collector's Bonds
Index, 1868-1969 (Series 67)
Register, 1868-1916 (Series 63)
Colonial and Revolutionary War Reference Collection, 1853, 1951, ca. 1990s (Series 319)
Commission on Government
Board of Supervisors Records, 1926-1937 (bulk 1936-1937) (Series 302)
Lough Papers, 1914-1937 (bulk 1934-1936) (Series 303)
Pforzheimer Papers, 1921-1956 (bulk 1934-1937) (Series 164)
Commissioners of Forfeiture Proceedings, 1784-1786 (Series 35)
Commissioners of Highways, c.1720-1795, 1826 (Series 77)
Commissioners of Partition, 1774 (Series 76)
Common Pleas, Court of -- See Court of Common Pleas
Community Mental Health Board / Community Services Board Minutes and Meeting Packets, 1970-1975, 1977-1992 (Series 361)
Community Mental Health Board – Miscellaneous Records, 1955-1956 (Series 369)
Community Relation Records, 1948-1982 (bulk late 1960s-1981) (Series 364)
Consumer Affairs
Weights and Measures Publicity Clippings, 1960-1990 (bulk 1973-1990)
(Series 274)
Coroner's Inquest
Index, 1886-1925 (Series 74)
Records, 1805, 1808, 1823-1829, 1832-1843 (gaps), 1853, 1874, 1897, 1905,
1909, 1911 (Series 266)
Corporation Registers, 1885-1929 (Series 292)
Corporations, See also Incorporations
Correction Department
Historical Records Collection, 1903, 1981, 1995 (Series 309)
Scrapbook, 1986-1989 (Series 307)
County Budgets, 1930-1991 (Series 110)
County Clerk
Correspondence and Memos, 1939-1981 (Series 53)
Financial Records, 1956-1982 (Series 54)
Miscellaneous Records, 1840-1916 (Series 51)
Miscellaneous Records, "Register's Office", 1857-1910 (Series 271)
Personnel Records, 1947-1982 (Series 56)
Property Map Index (Block Index), c.1766-1992 (Series 205)
Reports, 1940-1980 (Series 55)
Subject Files, 1940-1981 (Series 52)
see also Land Records Division; Legal Division; Motor Vehicle Division
County Court
Case Files, ca. 1847-ca. 1911 (Series 348)
Case Index, 1868-1933 (Series 341)
Minutes, 1853-1911 (Series 342)
Records, 1823-1870 (gaps) (Series 260)
Registers, 1847-1911 (Series 337)
County Elections and Appointments, 1907-1981 (Series 152)
County Executive
County Executive’s Office: Collected Studies and Reports, 1937-1968
(bulk 1950s-1961) (Series 367)
Subject Files, 1933-1973 (bulk 1939-1972) (Series 346)
see also Michaelian, Edwin G. Collection, County Executive Records
see also O’Rourke, Andrew, Administrative Files
County Historian
Files, 1987-1995 (Series 289)
Videotape Collection, 1984-1994 (Series 293)
County Home Reports, 1914-1961 (gaps) (Series 175)
County Office Building Plans, 1967-1974 (Series 256)
County Photographer Photograph Collection, ca. 1982-1996