John McKeon | |
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| United States Attorney for the Southern District of New York | |
| In office July 1854 – January 1858 | |
| President | Franklin Pierce |
| Preceded by | Charles O'Conor |
| Succeeded by | Theodore Sedgwick |
| District Attorney of New York County | |
| In office January 1, 1882 – November 22, 1883 | |
| Preceded by | Daniel G. Rollins |
| Succeeded by | John Vincent (Acting) |
| In office February 6, 1846 – December 31, 1850 | |
| Preceded by | Matthew C. Paterson |
| Succeeded by | N. Bowditch Blunt |
| Member of the U.S. House of Representatives from New York's 3rd district | |
| In office March 4, 1841 – March 3, 1843 | |
| Preceded by | Ogden Hoffman |
| Succeeded by | Jonas P. Phoenix |
| In office March 4, 1835 – March 3, 1837 | |
| Preceded by | Charles G. Ferris |
| Succeeded by | Ogden Hoffman |
| Member of the New York State Assembly from New York County | |
| In office 1832–1834 | |
| Personal details | |
| Born | March 29, 1808 Albany, New York, U.S. |
| Died | November 22, 1883 (aged 75) New York City, New York, U.S. |
| Political party | Democratic |
| Other political affiliations | Jacksonian |
| Alma mater | Columbia College |
John McKeon (March 29, 1808, Albany, New York – November 22, 1883, New York City) was an American lawyer and politician from New York. From 1835 to 1837, and 1841 to 1843, he served two non-consecutive terms in the U.S. House of Representatives as Jacksonian.