Series 151 Court Administration Facilities Records, 1959-1977
Series 152 County Elections and Appointments Records, 1907-1922, 1935-1981
Series 153 Municipal Elections and Appointments Records, 1898-1978 (bulk 1937-1955, 1970-1972)
Series 154 School Reports, 1828-1968 (gaps)
Series 155 Trademarks, 1925-1954
Series 156 Pforzheimer Papers: Westchester County Library System, 1936, 1939, 1945-1956
Series 157 Pforzheimer Papers: Purchase Free Library, 1924-1944
Series 158 Pforzheimer Papers: Purchase Property Owners Association, 1905-1951
Series 159 Pforzheimer Papers: Harrison-Purchase Citizens Committees, 1920-1952
Series 160 Pforzheimer Papers: Westchester County Council of Social Agencies, 1933-1959
Series 161 Pforzheimer Papers: Westchester County Association, 1950-1952
Series 162 Pforzheimer Papers: Miscellaneous Publications, 1921-1955
Series 163 Pforzheimer Papers: Planning Commission, 1929-1956
Series 164 Pforzheimer Papers: Commission on Government, 1921-1956 (bulk 1934-1937)
Series 165 Pforzheimer Papers: Joint Committee on Public Assistance, 1947-1952
Series 166 Bronx Valley Sewer Records, 1907-1916, 1939
Series 167 Guardianship Records, 1802-1931
Series 168 Administration Letters, 1787-1940
Series 169 Marriage License Affidavits, Licenses, and Certificates, 1908-1914, 1917-1935
Series 170 Westchester County Control Survey Reports, 1939, 1941, 1944
Series 171 Surrogate Records, Index, 1787-1983
Series 172 Department of Social Services: Director of Public Welfare Reports, 1915-1972
Series 173 Department of Social Services: Family and Child Welfare Division Reports, 1922-1961
Series 174 Department of Social Services: Director of Hospitals (Grasslands) Annual Reports, 1928-1947
Series 175 Department of Social Services: County Home Division Reports, 1914-1916, 1920-1921, 1923-1961
Series 176 Department of Social Services: Building and Power Plant Division Reports, 1943-1951
Series 177 Department of Social Services: Historical and Memorial Records, 1830-1974 (bulk 1913-1937, 1955-1974)
Series 178 Department of Social Services: Social Welfare Department Monthly Report Bulletins, 1961-1967
Series 179 Almshouse Records, 1854-1917
Series 180 Internal Archives Collection
Series 181 Works Progress Administration Survey - Veterans' Cemetery Records, Revolution to World War I
Series 182 Map Indexes by Town, 1800-1928
Series 183 Marriage Certificates Index, 1908-1935 (gaps)
Series 184 Marriage Certificates and Record with Abstract of Affidavit, 1908-1918
Series 185 Marriage Licenses Issued, 1921-1926
Series 186 Peekskill Scrapbook, c.1920
Series 187 V. Everit Macy Papers, 1900-1977 (bulk 1922-1930)
Series 188 V. Everit Macy Scrapbooks, 1913-1930
Series 189 Sheriff's Summons and Orders of Arrest Register, 1865-1867
Series 190 Voter Registration Books, 1925-1956
Series 191 Playland Commission Minutes, 1940-1975
Series 192 Liens on Vessels, c.1860-1963
Series 193 Playland Record of Gate Readings, 1936
Series 194 WALDO: Narratives, Correspondence and General Meeting Minutes, 1983-1990
Series 195 WALDO: Subcommittee Files, 1987-1990
Series 196 WALDO: Miscellaneous Articles, Lists and Reports, 1981-1990 (bulk 1985-1990)
Series 197 Health Department Annual and Statistical Reports, 1930-1988 (gaps)
Series 198 Health Department Publications, 1930-1941, 1955
Series 199 Environmental Health Services Annual Reports, 1960-1973
Series 200 Westchester County Government Publications, 1901-present