| Name | Sex | aka | Birth date | Birth location | Death date | Death location | Marriage date | Spouse |
| Clark, Chelsea Renee | Female | | | | | | | |
| Clark, Donald | Male | | Private | | | | | |
| Clark, Donald | Male | | | | | | | Hance, Waneta Helen |
| Clark, Donald | Male | | | | | | | Unknown, Linda |
| Clark, Dorthy | Female | | | | | | | |
| Clark, Dorthy | Female | | Private | | | | | |
| Clark, Edna | Female | | Private | | | | | |
| Clark, Edward,Jr | Female | | | | | | | |
| Clark, Edwin | Male | | | | | | | Unknown, Gwenlyn |
| Clark, Elizabeth | Female | | June 18, 1807 | England | September 06, 1807 | England | | |
| Clark, Elmer Elisha | Male | | WFT Est. 1861-1890 | | WFT Est. 1915-1975 | | WFT Est. 1887-1930 | Wood, Margret Ann |
| Clark, Emma Jane | Female | | November 23, 1888 | | November 29, 1935 | | January 15, 1919 | Fabing, George |
| Clark, Ethel | Female | | October 03, 1904 | | 1990 | | | |
| Clark, Ezekiel | Male | | 1763 | England | November 23, 1824 | England | November 23, 1796 | Brock, Elizabeth |
| Clark, Francis | Female | | Private | | | | | |
| Clark, Fred G. | Male | | September 11, 1896 | | June 17, 1965 | | | |
| Clark, George | Male | | | | | | | Morgan, Dorthy |
| Clark, George | Male | | February 03, 1885 | | February 10, 1943 | | WFT Est. 1916-1938 | Kelly, Louise |
| Clark, George | Male | | Private | | | | | |
| Clark, George, Jr. | Male | | | | | | | |
| Clark, Grace | Female | | March 04, 1890 | NY | WFT Est. 1891-1984 | | | |
| Clark, Harry Gilman, Jr | Male | | | | | | | Molnar, Dawna Barbara |
| Clark, Harry Gilman, Sr | Male | | October 01, 1912 | Hannawa Falls, NY | July 04, 1970 | Potsdam, NY | | Spring, Marion Rose |
| Clark, Harry Theodore | Male | | July 11, 1884 | | May 22, 1955 | | October 22, 1905 | Marsh, Alice N. |
| Clark, Henry Edward | Male | | October 03, 1904 | | 1957 | | | Simpson, Rhoda |
| Clark, Jack | Male | | October 03, 1894 | NY | June 25, 1949 | | | |
| Clark, Jack W., Jr. | Male | | | | | | | |
| Clark, Jack W., Sr. | Male | | | | | | | Young, Emma Lee |
| Clark, James | Male | | September 18, 1808 | England | December 29, 1839 | England | June 20, 1832 | Friett, Elizabeth |
| Clark, James | Male | | 1882 | | 1884 | | | |
| Clark, James II | Male | | May 30, 1840 | | WFT Est. 1841-1930 | | | |
| Clark, James Thomas "Jim" | Male | | September 19, 1858 | England | May 10, 1929 | NY | WFT Est. 1889-1905 | Barrett, Jane |
| Clark, Jason Joshua | Male | | | | | | | |
| Clark, Jefferson Davis | Male | | WFT Est. 1841-1868 | | WFT Est. 1891-1955 | | January 20, 1886 | Smith, Frances Olivia |
| Clark, Jennifer | Female | | | | | | | |
| Clark, John Fred | Male | | 1878 | | 1952 | NY | | |
| Clark, John Thomas | Male | | January 19, 1867 | England | February 24, 1939 | | May 29, 1889 | Goering, Wilhelmine |
| Clark, Kelli Marie | Female | | | | | | | |
| Clark, Kenneth | Male | | Private | | | | | |
| Clark, Kristina | Female | | | | | | | |
| Clark, Larry Dean | Male | | | | | | | Vinson, Vicki |
| Clark, Laura | Female | | Private | | | | | |
| Clark, Laura | Female | | WFT Est. 1854-1873 | | WFT Est. 1875-1958 | | WFT Est. 1875-1907 | Smith, James Franklin Alexander |
| Clark, Leigh Christina | Female | | | | | | | |
| Clark, Leslie Cleveland | Male | | | | | | | |
| Clark, Lois Dale | Female | | | | | | | Lee, Kenneth |
| Clark, Loretta | Female | | 1901 | | 1972 | | | |
| Clark, Louise | Female | | Private | | | | | |
| Clark, Luella (LuLu?) May | Female | | September 22, 1887 | | July 18, 1926 | | December 03, 1913 | Brown, James A. |
| Clark, Mable | Female | | July 28, 1892 | NY | January 03, 1940 | | | |