A Congress runs from noon on the 3rd January (20th Amendment Section I) in an odd numbered year until it expires exactly two years later. There may be, as this year, a "lame duck" session after the elections until both House and Senate adjourn "Sine Die" (which is done by a concurrent resolution). Unless recalled in an emergency, and the concurrent resolution normally has provisions for recall authority, the Congress then doesn't meet until it automatically expires. The First meeting of the New Congress may be on 3rd January or a later date agreed in advance. Each Congress is numbered, from the first which met in 1789. So the Congress which come into existence in eight weeks time will be the 112th Congress of the United States. The House is renewed for each Congress, but the Senate regards itself as a continuing body. (A very important point, which we will return to in future posts about the Cloture rules).
The dates and numbers of recent Congresses are
Number Dates House Majority Senate Majority
93rd 1973-1975 Dem Dem
94th 1975-1977 Dem Dem
95th 1977-1979 Dem Dem
96th 1979-1981 Dem Dem
97th 1981-1983 Dem Rep
98th 1983-1985 Dem Rep
99th 1985-1987 Dem Rep
100th 1987-1989 Dem Dem
101st 1989-1991 Dem Dem
102nd 1991-1993 Dem Dem
103rd 1993-1995 Dem Dem
104th 1995-1997 Rep Rep
105th 1997-1999 Rep Rep
106th 1999-2001 Rep Rep
107th 2001-2003 Rep Dem/Rep (Jan 20-Jun 6 2001)/Dem
108th 2003-2005 Rep Rep
109th 2005-2007 Rep Rep
110th 2007-2009 Dem Dem
111th 2009-2011 Dem Dem
112th 2011-2013 Rep Dem
In the United Kingdom the numbers are not so widely used. Instead the common practice is to refer to a Parliament by the year (or of there are two General Elections in one year, by month and year) of its first meeting. However, officuially the current Parliament is recognised as the 55th Parliament of the United Kingdom. (The Printed version of Hansard each Monday begins - "IN THE FIRST SESSION OF THE FIFTY-FIFTH PARLIAMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND [WHICH OPENED 18 MAY 2010]"
No. Election Government
46th Feb 1974 Labour
47th Oct 1974 Labour
48th 1979 Conservative
49th 1983 Conservative
50th 1987 Conservative
51st 1992 Conservative
52nd 1997 Labour
53rd 2001 Labour
54th 2005 Labour
55th 2010 Conservative/Liberal Democrat