30th-39th Congresses
Sunday sessions are marked in bold.
| Congress and Year | 1st Session | 2nd session | 3rd Session* |
|---|---|---|---|
| 30th (1847-1849) | December 18, 1847 | December 23, 1848 | |
| January 29, 1848 | January 6, 1849 | ||
| February 26, 1848 | January 13, 1849 | ||
| March 4, 1848 | January 20, 1849 | ||
| March 25, 1848 | January 27, 1849 | ||
| April 8, 1848 | February 3, 1849 | ||
| April 15, 1848 | February 10, 1849 | ||
| April 29, 1848 | February 17, 1849 | ||
| May 6, 1848 | February 24, 1849 | ||
| May 13, 1848 | March 3, 1849 | ||
| May 20, 1848 | |||
| June 3, 1848 | |||
| June 10, 1848 | |||
| June 17, 1848 | |||
| June 24, 1848 | |||
| July 1, 1848 | |||
| July 8, 1848 | |||
| July 15, 1848 | |||
| July 22, 1848 | |||
| July 29, 1848 | |||
| August 5, 1848 | |||
| August 12, 1848 | |||
| 31st (1849-1851) | December 8, 1849 | January 4, 1851 | |
| December 15, 1849 | January 11, 1851 | ||
| December 22, 1849 | January 18, 1851 | ||
| January 12, 1850 | January 25, 1851 | ||
| January 19, 1850 | February 1, 1851 | ||
| June 8, 1850 | February 8, 1851 | ||
| June 15, 1850 | February 15, 1851 | ||
| June 29, 1850 | February 22, 1851 | ||
| July 6, 1850 | March 1, 1851 | ||
| July 13, 1850 | |||
| July 20, 1850 | |||
| July 27, 1850 | |||
| August 3, 1850 | |||
| August 10, 1850 | |||
| August 17, 1850 | |||
| August 24, 1850 | |||
| August 31, 1850 | |||
| September 7, 1850 | |||
| September 14, 1850 | |||
| September 21, 1850 | |||
| September 28, 1850 | |||
| 32nd (1851-1853) | December 6, 1851 | January 15, 1853 | |
| January 24, 1852 | January 29, 1853 | ||
| March 6, 1852 | February 5, 1853 | ||
| March 13, 1852 | February 12, 1853 | ||
| March 20, 1852 | February 19, 1853 | ||
| March 27, 1852 | February 26, 1853 | ||
| April 24, 1852 | |||
| May 1, 1852 | |||
| May 22, 1852 | |||
| May 29, 1852 | |||
| June 12, 1852 | |||
| June 26, 1852 | |||
| July 3, 1852 | |||
| July 10, 1852 | |||
| July 17, 1852 | |||
| July 24, 1852 | |||
| July 31, 1852 | |||
| August 7, 1852 | |||
| August 14, 1852 | |||
| August 21, 1852 | |||
| August 28, 1852 | |||
| 33rd (1853-1855) | December 31, 1853 | December 30, 1854 | |
| May 6, 1854 | January 6, 1855 | ||
| May 13, 1854 | January 20, 1855 | ||
| June 10, 1854 | January 27, 1855 | ||
| June 17, 1854 | February 3, 1855 | ||
| June 24, 1854 | February 10, 1855 | ||
| July 1, 1854 | February 17, 1855 | ||
| July 8, 1854 | February 24, 1855 | ||
| July 15, 1854 | March 3, 1855 | ||
| July 22, 1854 | |||
| July 29, 1854 | |||
| August 5, 1854 | |||
| 34th (1855-1857) | December 8, 1855 | August 23, 1856 | December 20, 1856 |
| December 15, 1855 | August 30, 1856 | January 10, 1857 | |
| December 22, 1855 | January 17, 1857 | ||
| December 29, 1855 | January 24, 1857 | ||
| January 5, 1856 | January 31, 1857 | ||
| January 12, 1856 | February 7, 1857 | ||
| January 19, 1856 | February 14, 1857 | ||
| January 26, 1856 | February 21, 1857 | ||
| February 2, 1856 | February 28, 1857 | ||
| May 10, 1856 | |||
| June 7, 1856 | |||
| June 14, 1856 | |||
| June 21, 1856 | |||
| June 28, 1856 | |||
| July 12, 1856 | |||
| July 19, 1856 | |||
| July 26, 1856 | |||
| August 2, 1856 | |||
| August 9, 1856 | |||
| August 16, 1856 | |||
| 35th (1857-1859) | December 19, 1857 | December 11, 1858 | |
| March 20, 1858 | January 8, 1859 | ||
| March 27, 1858 | January 15, 1859 | ||
| April 17, 1858 | January 22, 1859 | ||
| April 24, 1858 | January 29, 1859 | ||
| May 8, 1858 | February 5, 1859 | ||
| May 15, 1858 | February 12, 1859 | ||
| May 22, 1858 | February 19, 1859 | ||
| May 29, 1858 | February 26, 1859 | ||
| June 5, 1858 | |||
| June 12, 1858 | |||
| 36th (1859-1861) | December 10, 1859 | January 12, 1861 | |
| December 17, 1859 | January 19, 1861 | ||
| December 24, 1859 | January 26, 1861 | ||
| January 7, 1860 | February 2, 1861 | ||
| February 11, 1860 | February 9, 1861 | ||
| May 5, 1860 | February 16, 1861 | ||
| May 12, 1860 | February 23, 1861 | ||
| May 19, 1860 | March 2, 1861 | ||
| May 26, 1860 | |||
| June 2, 1860 | |||
| June 9, 1860 | |||
| June 16, 1860 | |||
| June 23, 1860 | |||
| 37th (1861-1863) | July 6, 1861 | February 22, 1862 | January 31, 1863 |
| July 13, 1861 | May 24, 1862 | February 7, 1863 | |
| July 27, 1861 | July 5, 1862 | February 14, 1863 | |
| August 3, 1861 | July 12, 1862 | February 21, 1863 | |
| February 28, 1863 | |||
| 38th (1863-1865) | February 27, 1864 | January 7, 1865 | |
| March 5, 1864 | January 28, 1865 | ||
| March 12, 1864 | February 4, 1865 | ||
| March 19, 1864 | February 11, 1865 | ||
| March 26, 1864 | February 18, 1865 | ||
| April 2, 1864 | February 25, 1865 | ||
| April 9, 1864 | |||
| April 16, 1864 | |||
| April 23, 1864 | |||
| April 30, 1864 | |||
| June 4, 1864 | |||
| June 11, 1864 | |||
| June 18, 1864 | |||
| June 25, 1864 | |||
| July 2, 1864 | |||
| 39th (1865-1867) | January 27, 1866 | January 5, 1867 | |
| February 3, 1866 | January 12, 1867 | ||
| February 10, 1866 | January 19, 1867 | ||
| February 17, 1866 | January 26, 1867 | ||
| February 24, 1866 | February 2, 1867 | ||
| March 3, 1866 | February 9, 1867 | ||
| March 10, 1866 | February 16, 1867 | ||
| March 17, 1866 | February 23, 1867 | ||
| March 24, 1866 | March 2, 1867 | ||
| April 7, 1866 | |||
| April 14, 1866 | |||
| April 21, 1866 | |||
| April 28, 1866 | |||
| May 5, 1866 | |||
| May 19, 1866 | |||
| May 26, 1866 | |||
| June 9, 1866 | |||
| June 16, 1866 | |||
| June 23, 1866 | |||
| June 30, 1866 | |||
| July 7, 1866 | |||
| July 14, 1866 | |||
| July 21, 1866 | |||
| July 28, 1866 |
* Congressional leaders discontinued the use of third sessions by the end of the 1930s. The ratification of the 20th Amendment in 1933, provided for Congress to assemble on or about the third day of January rather than the traditional March start date. Third sessions, which generally had run from December to March, no longer were necessary.