1680 - 
| John Underwood | |
| B: | 1850 |
| D: | 1853 |
| Elizabeth Adele Underwood | |
| B: | 1854 |
| D: | Yes, date unknown |
| Paul Underwood | |
| B: | 11 May 1887 |
| Patchogue, Suffolk, New York, United States | |
| D: | 11 Feb 1891 |
| Patchogue, Suffolk, New York, United States | |
| William L Underwood | |
| B: | Jan 1889 |
| New York | |
| D: | Yes, date unknown |
| Olive Underwood | |
| B: | 8 Apr 1891 |
| Patchogue, Suffolk, New York, United States | |
| D: | 2 Oct 1967 |
| Patchogue, Suffolk, New York, United States | |
| Carl Axel Brodde | |
| B: | 1882 |
| Stockholm's Ian, Sweden | |
| M: | 14 Feb 1915 |
| D: | 8 Apr 1936 |
| Patchogue, Suffolk, New York, United States | |
| Gerald Henry Smalling, Sr | |
| B: | 13 Feb 1898 |
| Patchogue, Suffolk, New York, United States | |
| D: | 17 Jan 1964 |
| Patchogue, Suffolk, New York, United States | |
| Edward John Underwood | |
| B: | 8 Apr 1891 |
| Patchogue, Suffolk, New York, United States | |
| D: | 27 Jun 1951 |
| Patchogue, Suffolk, New York, United States | |
| Edythe Piggott | |
| B: | 16 Nov 1899 |
| Brooklyn, Kings, New York | |
| D: | 1977 |
| Millicent Ann Westerfield | |
| B: | 19 Oct 1922 |
| New Haven, New Haven, Connecticut, United States | |
| D: | 22 Jun 2005 |
| Patchogue, Suffolk, New York, United States | |
| Rose Josephine Westerfeld | |
| B: | 4 Feb 1927 |
| Connecticut, United States | |
| D: | 1988 |
| Millicent Underwood | |
| B: | 29 Jul 1893 |
| Patchogue, Suffolk, New York, United States | |
| D: | 13 Jan 1956 |
| Brookhaven, Suffolk, New York, United States | |
| William Westfield | |
| B: | 25 May 1895 |
| Manhattan, New York, New York, USA | |
| D: | 2 Dec 1967 |
| Ocala, Marion, Florida, United States | |
| Ruth Underwood | |
| B: | 1896 |
| New York | |
| D: | Yes, date unknown |
| Virginia S Underwood | |
| B: | 13 Mar 1925 |
| Patchogue, Brookhaven, Suffolk, New York, United States | |
| D: | 4 Nov 1976 |
| Easton, Fairfield, Connecticut, United States | |
| William Lawrence Underwood | |
| B: | 27 Feb 1928 |
| New York | |
| D: | 3 May 2022 |
| Patchogue, Brookhaven, Suffolk, New York, United States | |
| William Lawrence Underwood | |
| B: | 30 Jan 1899 |
| Patchogue, Suffolk, New York, United States | |
| D: | 5 Apr 1977 |
| Patchogue, Suffolk, New York, United States | |
| Virginia Dare Shand | |
| B: | 8 Feb 1897 |
| Patchogue, Suffolk, New York, United States | |
| M: | 28 Sep 1924 |
| Suffolk, New York, United States | |
| D: | May 1976 |
| Patchogue, Suffolk, New York, United States | |
| Josephine Underwood | |
| B: | 9 Apr 1901 |
| New York, United States | |
| D: | 4 Mar 1982 |
| Los Angeles, Los Angeles, California, United States | |
| Robert Chester Goodell | |
| B: | 15 Apr 1878 |
| Mount Washington, Berkshire, Massachusetts, United States | |
| D: | 24 Sep 1957 |
| William Woodhull Underwood | |
| B: | 16 Jan 1856 |
| Freeport, Nassau, New York, United States | |
| D: | 16 Jan 1930 |
| Patchogue, Suffolk, New York, United States | |
| Josephine Mary Finn | |
| B: | 25 Nov 1866 |
| Wexford, County Wexford, Ireland | |
| M: | 8–1886 |
| D: | 30 Sep 1943 |
| Frank Underwood | |
| B: | 1858 |
| New York | |
| D: | Yes, date unknown |
| Susan Underwood | |
| B: | Abt 1858 |
| Groton, Tompkins, New York, United States | |
| D: | 9 Nov 1932 |
| Bridgeport, Fairfield, Connecticut, United States | |
| Josiah Underwood | |
| B: | 1867 |
| Port Jefferson, Suffolk, New York, United States | |
| D: | 17 May 1879 |
| Patchogue, Suffolk, New York, United States | |
| John Underwood | |
| B: | 31 Aug 1869 |
| Port Jefferson, Suffolk, New York, United States | |
| D: | 11 Dec 1869 |
| Patchogue, Suffolk, New York, United States | |
| Bertha Underwood | |
| B: | Aug 1877 |
| New York | |
| D: | 2 Feb 1914 |
| John Wesley Underwood | |
| B: | 26 Jan 1818 |
| Groton, Tompkins, New York, United States | |
| D: | 8 Apr 1873 |
| Brookhaven (Patchogue), Suffolk, New York, United States | |
| Amelia Huff | |
| B: | 13 Feb 1828 |
| Newburgh, Orange, New York, United States | |
| M: | Abt 1840 |
| Village of Groton, Tompkins County, New York | |
| D: | 3 Jan 1892 |
| Norwalk, Fairfield, Connecticut, United States | |
| Stanley Underwood | |
| B: | 1843 |
| Groton, Tompkins, New York, United States | |
| D: | 19 Jun 1861 |
| Manhattan, New York City, New York | |
| John W Underwood | |
| B: | 27 Feb 1846 |
| McLean, Tompkins, New York, United States | |
| D: | 15 Sep 1846 |
| McLean, Tompkins, New York, United States | |
| Eliza Jane Smith | |
| B: | 18 Dec 1818 |
| M: | Abt 1840 |
| Village of Groton, Tompkins County, New York | |
| D: | 4 Mar 1846 |
| Town of Groton, Tompkins County, New York | |
| William Underwood | |
| B: | 19 Dec 1789 |
| Kingston, Luzerne, Pennsylvania, USA | |
| D: | 17 Aug 1865 |
| Groton, Tompkins, New York, USA | |
| Ruth Goodwin | |
| B: | 23 Apr 1794 |
| Tompkins, New York, USA | |
| M: | Abt 1810 |
| Tompkins Co, New York, United States | |
| D: | 22 Apr 1888 |
| Groton, Tompkins, New York, USA | |
| Israel Underwood | |
| B: | 4 Apr 1746 |
| Plainfield, Windham, Connecticut | |
| D: | 15 Jun 1817 |
| Lansing, Tompkins, New York, USA | |
| Doritha Benjamin | |
| B: | 22 Apr 1752 |
| Canterbury, Windham, Connecticut Colony, British Colonial America | |
| D: | 1840 |
| , Tompkins, New York, USA | |
| Israel Underwood | |
| B: | 1720 |
| Plainfield, Windham, Connecticut Colony, British Colonial America | |
| D: | 13 Jun 1788 |
| Pomfret, Windham, Connecticut Colony, British Colonial America | |
| Ruth Bassett | |
| B: | 22 Jun 1715 |
| East Greenwich, Kent, Rhode Island, British Colonial America | |
| D: | Pomfret, Windham, Connecticut Colony, British Colonial America |
| Elizabeth Underwood() | |
| B: | 1680 |
| Massachusetts | |
| D: | Massachusetts |
| Israel Underwood | |
| B: | 13 Jan 1682 |
| Boston, Suffolk, Massachusetts Bay Colony, British Colonial America | |
| D: | Yes, date unknown |
