Series 351 Optometrists Register, 1909-1950
Series 352 Commissioner of Public Works Files, 1926-1982 (bulk early 1950s – early 1970s)
Series 353 Parks Department Statistical Ledgers, 1962, 1964
Series 354 Westchester County Park Commission – Payroll Books, 1931-1932, 1934-1941
Series 355 Internal Archives Collection
Series 356 Tax Sales and Tax Registers, 1862-1914 (gaps)
Series 357 Department of Public Works Subject Files: Drainage / Flood Control, 1941-1980
Series 358 Playland Postcard Collection, n.d.
Series 359 Fire District Historical Records, 1922-1995 (bulk 1926-1933)
Series 360 Board of Supervisors / Board of Legislators Local Laws, 1960-1984
Series 361 Community Mental Health Board / Community Services Board Minutes and Meeting Packets, 1970-1975, 1977-1992
Series 362 Public Works Engineering Office Correspondence Files, 1966-1975 (bulk 1968-1974)
Series 363 Office for the Disabled Subject Files, 1975-1995
Series 364 Health Department Community Relations Records, 1948-1982 (bulk late 1960s-1981)
Series 365 "Westchester County News" [Press Releases], April 1955-September 1961
Series 366 Planning Department Correspondence and Progress Reports, 1983-1986
Series 367 County Executive’s Office: Collected Studies and Reports, 1937-1968 (bulk 1950s-1961)
Series 368 Planning Commissioner Peter Q. Eschweiler Collection, 1914-1998 (1967-1991 bulk)
Series 369 Community Mental Health Board – Miscellaneous Records, 1955-1956
Series 370 Charter and Administrative Code Revision Committee Records, 1957-1961
Series 371 Playland Administrative Records, 1979-1988 (bulk 1982-1988)
Series 372 Elijah Miller House / Washington’s Headquarters Museum Records, ca. 1917-2011
Series 373 World War I Alien Registration Forms, 1818
Series 374 State Department of Transportation Westchester County Parkway Maps - Currently being processed
Series 375 Parks Department Commissioner’s Office Records, 1925-1989 (1970s-1980 bulk)
Series 376 Youth Services Division Records, Office of the County Executive, 1959-1975 (bulk 1962-1972)
Series 377 Internal Archives Collection
Series 378 Board of Acquisition and Contract Calendars, 1978-1980, 1982-1986
Series 379 Playland Investigation Proceedings, 1936
Series 380 Park Commission Land Record Cards, ca. 1914-1985
Series 381 Park Commission Land Acquisition Name Index Cards, ca. 1920s-1940s
Series 382 Park Commission Indexes to Park Commission Park and Parkway Deeds, ca. 1912-1970
Series 383 Parks Department Director of Management Planning and Property Records, 1951, 1966-1989 (bulk mid-1970s-early 1980s)
Series 384 Parks Department Miscellaneous Photograph Collection, ca. 1910-1940
Series 385 Park Commission Index to Condemnation Proceedings, ca. 1920s-1932
Series 386 Park Commission County Lands to be Released, ca. 1939
Series 387 Parks Department Bronx River Parkway Records, 1924-1977, 1980-2003 (bulk late 1920s-early 1970s)
Series 388 Board of Supervisors – Charter Revision Committee, 1922-1984 (bulk 1951-1969)
Series 389 Westchester County Building Commission – Courthouse Construction Records, March 1915-November 1916
Series 390 Board of Health Records, 1929-1991 (gaps)
Series 391 Internal Archives Collection
Series 392 Andrew O’Rourke Administrative Files, 1978-1988 (bulk 1982-1987)
Series 393 Internal Archives Collection
Series 394 Michaelian, Edwin G. Collection: Speeches and Proclamations, 1958-1973
Series 395 Park Commission Park and Parkway Land Acquisition Records (Currently being processed)
Series 396 Naturalization Petition Index Cards on Microfilm, ca. 1930s-1991
Series 397 Probation Department Centennial Photo Album
Series 398 CROS Property Maps (Currently being processed)
Series 399 Board of Legislators: Daniel P. Thomas Files, 1986-1995