30th to 39th Congresses (1847–1867)

Sunday sessions are marked in bold. 

Congress and Year1st Session2nd 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, 1851January 15, 1853 
  January 24, 1852 January 29, 1853 
  March 6, 1852February 5, 1853 
 March 13, 1852February 12, 1853 
 March 20, 1852February 19, 1853 
 March 27, 1852February 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.