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This article is part of the series: United States Senate
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The three classes of US Senators, each currently including 33 or 34 Senators (since Hawaii became the 50th state in 1959, and until another state is admitted), are a means used by the United States Senate for describing the schedules of Senate seats' elections, and of the expiration of the terms of office of the Senators holding the respective seats.

Contents 1 Historical division 2 Classes 2.1 Class I 2.2 Class II 2.3 Class III 3 Current Senators in each class by party 4 External links

The U.S. Constitution specifies staggered 6-year terms for Senators, and there are special provisions for getting a new state into a situation that makes that pattern continue automatically:

• around the time of the first federal elections, in 1788, each state appointed its two Senators for, respectively,
  • Class I: a two-year and a six-year term,
  • Class II: a four-year and a six-year term,
  • Class III: a two-year and a four-year term,
• upon the expiration of a Senator's term of any length, someone starts a new six-year term as Senator (based on appointment in most states, until the Seventeenth Amendment required direct popular election of Senators);
• when a new state is admitted to the Union, its two Senators have terms that correspond to those of two different classes, among the three classes defined below;
• which two classes is determined by a scheme that keeps the three classes as close to the same size as possible, i.e., that avoids any class differing by more than one from the minimum-sized class.

(This means at least one of a new state's first pair of Senators has a term of less than six years, and one term is either two or four years shorter than the other.)

Class I consists of

• the 33 current Senators whose seats have been submitted to re-election in November 2012, and whose terms end in January 2013; and
• earlier Senators with terms ending in 2007, 2001, 1995, 1989, 1983, 1977, 1971, 1965, 1959, and back to 1791; and
• some Senators who were successors to Senators who started two-year terms in 1789.
• Current States with a Class I Senator: Arizona, California, Connecticut, Delaware, Florida, Hawaii, Indiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Jersey, New Mexico, New York, North Dakota, Ohio, Pennsylvania, Rhode Island, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, and Wyoming.

Class II consists of

• the 33 current Senators whose seats are scheduled for re-election in November 2008, and whose terms end in January 2009; and
• earlier Senators with terms that ended in 2003, 1997, 1991, 1985, 1979, 1973, 1967, 1961, and back to 1793; and
• some Senators who were successors to Senators who started four-year terms in 1789.
• Current States with a Class II Senator: Alabama, Alaska, Arkansas, Colorado, Delaware, Georgia, Idaho, Illinois, Iowa, Kansas, Kentucky, Louisiana, Maine, Massachusetts, Michigan, Minnesota, Mississippi, Montana, Nebraska, New Hampshire, New Jersey, New Mexico, North Carolina, Oklahoma, Oregon, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Virginia, West Virginia, and Wyoming.

Class III consists of

• the 34 current Senators whose seats are scheduled for re-election in November 2010, and whose terms end in January 2011; and
• earlier Senators with terms that ended in 2005, 1999, 1993, 1987, 1981, 1975, 1969, 1963, and back to 1795; and
• some Senators who were successors to Senators who started six-year terms in 1789.
• Current States with a Class III Senator: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Missouri, Nevada, New Hampshire, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, South Dakota, Utah, Vermont, Washington, and Wisconsin.

As of January 15, 2007:

		Class 1	Class 2	Class 3	Total
Last election:		2006	2002	2004
	Republican	9	21	19	49
	Democratic	22	12	15	49
	Independent	2	0	0	2
Total:		33	33	34	100
Next election:		2012	2008	2010

• US Senate class page (old)
• Current Class I, (senate.gov)
• Current Class II, (senate.gov)
• Current Class III, (senate.gov)

United States Congress House of Representatives, Senate — 110th Congress
Members	House: Current, Former, Districts (by area) | Senate: Current (by seniority, by age), Former (expelled/censured), Classes
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