| Birth | 10 Aug 1821 | Sandusky, Huron County, Ohio | | | |
| Occupation | Abt 1835 | Sandusky, Huron, Ohio, United States | | | |
| Occupation | 1838 | clerk with the banking firm E W Clark & Co - Philadelphia, Philadelphia County, Pennsylvania | | | |
| Occupation | 1842 | full partner in E W Clark & Co bank firm - Philadelphia, Philadelphia County, Pennsylvania | | | |
| Marriage | 1844 | Dorothea Elizabeth "Dora" ALLEN | | | |
| Retirement | 1858 | Philadelphia, Philadelphia County, Pennsylvania | | | |
| Residence | 20 Jun 1860 | & was a farmer - Cheltenham, Montgomery County, Pennsylvania | | | |
| Occupation | 1 Jan 1861 | founder & partner with Wm G Moorhead in the bank Jay Cooke & Co of Philadelphia - Philadelphia, Philadelphia County, Pennsylvania | | | |
| Miscellaneous | 17 Jul 1861 | Philadelphia, Philadelphia County, Pennsylvania | | | |
| Miscellaneous | 26 Jul 1861 | Philadelphia, Philadelphia County, Pennsylvania | | | |
| Miscellaneous | 29 Jul 1861 | & his brother spoke with the wealthy man of the city & they obtained a guarantee for $1, 500,000 - Philadelphia, Philadelphia County, Pennsylvania | | | |
| Miscellaneous | Jul 1861 | Philadelphia, Philadelphia County, Pennsylvania | | | |
| Miscellaneous | 14 Jun 1862 | Sandusky, Erie County, Ohio | | | |
| Miscellaneous | Aft Jun 1865 | & the firm of Jay Cooke & Co established a branch - Washington, District of Columbia, United States | | | |
| Miscellaneous | Aft 1865 | & his bank financed the construction of the Northern Pacific Railway | | | |
| Miscellaneous | 1 Jan 1866 | & the firm of Jay Cooke & Co established a branch - New York , New York County, New York | | | |
| Miscellaneous | 9 Jan 1866 | Philadelphia, Philadelphia County, Pennsylvania | | | |
| Miscellaneous | 1867 | his brother Henry & sister-in-law had property including their mansion put in trust in Jay's name - Georgetown, District of Columbia | | | |
| Residence | Abt 1867 | Philadelphia, Philadelphia County, Pennsylvania | | | |
| Miscellaneous | Jan 1868 | gave his worth at this time at over $2,000,000 - Philadelphia, Philadelphia County, Pennsylvania | | | |
| Miscellaneous | | purchased the island and built a mansion on it - Gibraltar Island, Ottawa County, Ohio | | | |
| Miscellaneous | 2 Apr 1870 | Washington, District of Columbia | | | |
| Residence | 18 Jul 1870 | & was a banker - Cheltenham, Montgomery County, Pennsylvania | | | |
| Miscellaneous | 1 Jan 1871 | & the firm Jay Cooke & Co took an interest in a banking house with new partners & interests - London, England | | | |
| Miscellaneous | 1873 | | | | |
| Miscellaneous | 25 Sep 1873 | Philadelphia, Philadelphia County, Pennsylvania | | | |
| Miscellaneous | Abt Jan 1874 | Philadelphia, Philadelphia County, Pennsylvania | | | |
| Miscellaneous | Abt 1879 | was able to meet all his financial obligations & was out of insolvency | | | |
| Residence | 11 Jun 1880 | with his son-in-law & daughter Laura & was a widow & not employed - Cheltenham, Montgomery County, Pennsylvania | | | |
| Residence | 6 Jun 1900 | with his daughter Laura & son-in-law & was a widow - Cheltenham, Montgomery County, Pennsylvania | | | |
| Death | 16 Feb 1905 | suddenly at the home of his daughter Laura & Son-in-law - Ogontz, Philadelphia County, Pennsylvania | | | |
| Burial | Aft 16 Feb 1905 | Saint Paul's Episcopal Churchyard, Elkins Park, Montgomery County, Pennsylvania | | | |