| Birth | 4 Jul 1835 | Williamsburg, Hampshire County, Massachusetts | | | |
| Miscellaneous | 1849 | had his name legally changed in a special act of the legislature | | | |
| Alt name | 1850 | William Pomeroy CLAPP | | | |
| Marriage | 1 Jan 1861 | Susan Ann NEWCOMB | | | |
| Military | | was with the 52d Mass. Vol. Inf. during the Civil War | | | |
| Occupation | 7 Sep 1862 | carpenter - Northampton, Hampshire County, Massachusetts | | | |
| Residence | 8 Sep 1862 | Northampton, Hampshire County, Massachusetts | | | |
| Military | 9 Sep 1862 | enlisted as a Private - Northampton, Hampshire County, Massachusetts | | | |
| Military | 2 Oct 1862 | mustered in Company C, 52nd Infantry Regiment Massachusetts - Massachusetts | | | |
| Military | 14 Aug 1863 | mustered out of Company C, 52nd Infantry Regiment Massachusetts - Camp Miller, Greenfield, Franklin County, Massachusetts | | | |
| Miscellaneous | 1865 | served 11 months and 26 days during the Civil War | | | |
| Occupation | 22 Jun 1870 | wood worker - Northampton, Hampshire County, Massachusetts | | | |
| Residence | Abt 1874 | and was a machinist - Northampton, Hampshire County, Massachusetts | | | |
| Occupation | 11 Jun 1880 | mechanic - Northampton, Hampshire County, Massachusetts | | | |
| Miscellaneous | 1888 | built his house at 102 Crescent St. - Northampton, Fulton County, New York | | | |
| Residence | Jun 1890 | on Cresent St. - Northampton, Hampshire County, Massachusetts | | | |
| Miscellaneous | 29 Jun 1892 | applied for a Civil War Pension as an invalid | | | |
| Occupation | 1896 | pattern maker for the Norwood Company - Florence, Hampshire County, Massachusetts | | | |
| Religion | 1896 | spiritualist - Northampton, Hampshire County, Massachusetts | | | |
| Occupation | 2 Jun 1900 | stair builder - pattern maker - Northampton, Hampshire County, Massachusetts | | | |
| Residence | 2 Jun 1900 | at [412] Covenant St. - Northampton, Hampshire County, Massachusetts | | | |
| Miscellaneous | 5 Mar 1907 | applied for a Civil War Pension as an invalid | | | |
| Residence | 24 May 1910 | at 18 Summer St. - Northampton, Hampshire County, Massachusetts | | | |
| Death | 23 Dec 1910 | | | | |