ca. 1920s-1960s Playland Phonograph Collection (Series 139)
c.1925-1932 Parks Department Map Index (Series 99)
1925-1954 Trademarks (Series 155)
1925-1956 Voter Registration Books (Series 190)
1925-1958 Grade Crossing Elimination Records (Series 115)
1925-1961 (gaps) Recreation Commission Annual Reports (Series 97)
1925-1929 (gaps); 1930-1969 Board of Supervisors Board Meeting Packets (Series 299)
1925-1975 Parks Department Correspondence and Studies (Series 88)
1925-1985 Department of Public Safety "In Memoriam" Collection (Series 285)
1925-1989 (1970s-1980 bulk) Parks Department Commissioner’s Office Records (Series 375)
1926-1932, 1937 Park Commission Financial Reports (Series 117)
1926-1937 (bulk 1936-1937) Board of Supervisors: Records of Commission on Government (Series 302)
c.1926-1960 Park Commission Minutes Index (Series 90)
1926-1962 Parks Department Ordinances (Series 120)
1926-1966 Hugh R. Pomeroy Collection (Series 21)
1926, November 1928-1971, 1974-1976 Budget and Appropriations Committee Meeting Minutes (Series 339)
1926-1982 (bulk early 1950s–early 1970s) Commissioner of Public Works Files (Series 352)
1927-1933, 1935 Park Commission, Appraisal Commissioners, Appeals and Minutes (Series 105)
1927-1972 Naturalization Records Index (Series 130)
1928-1938 Works Progress Administration Cemetery Survey Forms - Photocopies (Series 294)
1928-1947 Department of Social Services: Director of Hospitals (Grasslands) Annual Reports (Series 174)
1928-1969 (bulk) [1890-1978 full date range] Board of Supervisors / Board of Legislators Subject Files (Series 300)
1929-1956 Pforzheimer Papers: Planning Commission (Series 163)
1929-1971 Voter Enrollments (Series 102)
1929-1986 Naturalizations – Court Orders (Series 343)
1929-1991 (gaps) Board of Health Records (Series 390)
1930-1932 Sanitary Sewer Commission Annual Reports (Series 208)
c.1930s-early 1950s Westchester County Control Survey Records, Department of Public Works Files (Series 268)
1930-1950 Finance Department Scrapbooks (Series 335)
1930-1941, 1955 Health Department Publications (Series 198)
1930-1988 (gaps) Health Department Annual and Statistical Reports (Series 197)
1930-1991 County Budgets (Series 110)
c.1930s-1991 Naturalization Petition Index Cards on Microfilm (Series 396)
c.1930s-2006 (bulk 1980s-2006) Parks Department Contact Sheets / Prints Collection (Series 322)
1931-1932, 1934-1941 Westchester County Park Commission – Payroll Books (Series 354)
1931-1956 Playland Concession Records (Series 136)
1933 Historic American Buildings Survey Drawings (Series 64)
1933-1936 Blue Mountain Reservation -- Reports and Photographs (Series 277)
1933-1944 Park Commission Real Estate Legislation and Data Collection (Series 210)
1933-1959 Pforzheimer Papers: Westchester County Council of Social Agencies (Series 160)
1933-1973 (bulk 1939-1972) County Executive Subject Files (Series 346)
1934 Environmental Health Services Master’s Thesis (Series 207)
1934, 1959, 1967-1975 Parks Department Road Contracts (Series 113)
1936 Park Acquisitions (Series 116)
1936 Playland Record of Gate Readings (Series 193)
1936 Playland Investigation Proceedings (Series 379)
1936-1940 Work Projects Administration Records (Series 8)
1936, 1939, 1945-1956 Pforzheimer Papers: Westchester County Library System (Series 156)
1936-1939, 1954-1986 (gaps) Board of Elections Annual Reports (Series 144)
1936-1998 (gaps) Election and Canvass Records (Series 140)
1937-1946 Airport Construction Files (Series 84)
1937-1956 Playland Administrative Files (Series 135)
1937-1967 (bulk 1941-1942) Naturalization Repatriation Proceedings, 1937-1967 (Series 287)
1937-1968 (bulk 1950s-1961) County Executive’s Office: Collected Studies and Reports (Series 367)
1938, 1942-1972 New Rochelle Health Department Annual Reports (Series 211)
1938-1946 Practical Nurses Register (Series 81)
c.1939 Park Commission -- County Lands to be Released (Series 386)
1939, 1941, 1944 Westchester County Control Survey Reports (Series 170)
1939, 1949, 1951-1983 Edwin G. Michaelian Collection: Scrapbooks and Clippings (Series 31)
1939-1978, 1980-1989 Board of Acquisition and Contract Minutes (Series 83)
1939-1981 County Clerk Correspondence and Memos (Series 53)
1939-1983 Planning Board Minutes (Series 22)
1939-1992 (bulk 1969-1992) Planning Board Meeting Materials (Series 338)
1940-1968 Board of Elections Correspondence (Series 85)
1940-1975 Playland Commission Minutes (Series 191)
1940-1970 Election Petitions and Certificates Filed (Series 142)
1940-1980 County Clerk Reports (Series 55)
1940-1981 County Clerk Subject Files (Series 52)
1941-1948 Cross County Parkway Association Minutes (Series 119)
1941-1950 Dentists Register and Affidavits (Series 38)
1941-1980 Department of Public Works Subject Files, Drainage and Flood Control (Series 357)
1942-1978 Acquisition & Contract -- Airport Agreements (Series 276)
1943-1951 Department of Social Services: Building and Power Plant Division Reports (Series 176)
1943-1961 Park Commission Agenda (Series 89)
1943-present Planning Department Maps Collections (Series 312)
1944-1948 Westchester Cross County Parkway Authority Calendars and Minutes (Series 320)
1944-1974 Planning Department Correspondence, Memos and Speeches (Series 321)
1944-1977 Airport Subject Files, Commissioner of Public Works (Series 270)
1944-1984 (bulk 1950-1966) Airport Scrapbooks (Series 248)
1947-1950 Dental Hygienists Affidavits (Series 39)
1947-1951 Professional Engineers Register (Series 82)
1947-1952 Pforzheimer Papers: Joint Committee on Public Assistance (Series 165)
1947-1965, 1969-1972 Hotel Reports (Series 203)
1947-1971 Personnel Office Scrapbooks (Series 334)
1947-1982 County Clerk Personnel Records (Series 56)
1948-1981 Court Administration Miscellaneous Records (Series 59)
1948-1982 (bulk late 1960s-1981) Community Relation Records (Series 364)