BREAKDOWN:
46 Senators
22 Democrats & 24 Republicans
8 states are split Republican/Democrat
8 states are all Republican
7 states are all Democrats
The three classes of the Senate were then specified by Article I, Section 3 of the U.S. Constitution:
Immediately after they shall be assembled in Consequence of the first Election, they shall be divided as equally as may be into three Classes. The Seats of the Senators of the first Class shall be vacated at the Expiration of the second Year, of the second Class at the Expiration of the fourth Year, and of the third Class at the Expiration of the sixth Year, so that one third may be chosen every second Year.
ALABAMA
Jeff Sessions (Republican)
Class II
326 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4124
Contact: http://www.sessions.senate.gov/public/index.cfm?FuseAction=ConstituentServices.ContactMe
Richard Shelby (Republican)
Class III
304 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-5744
Contact: http://www.shelby.senate.gov/public/index.cfm/emailsenatorshelby
ARKANSAS
John Boozman (Republican)
Class III
320 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4843
Contact: http://www.boozman.senate.gov/public/index.cfm/e-mail-me
Mark Pryor (Democrat)
Class II
255 DIRKSEN SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone:(202) 224-2353
Contact: http://www.pryor.senate.gov/public/index.cfm?p=ContactMe
CALIFORNIA
Barbara Boxer (Democrat)
Class III
112 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-3553
Contact: http://www.boxer.senate.gov/en/contact/
Dianne Feinstein (Democrat)
Class I
331 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-3841
Contact: http://www.feinstein.senate.gov/public/index.cfm/e-mail-me
DELAWARE
Thomas Carper (Democrat)
Class I
513 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-2441
Contact: carper.senate.gov/public/index.cfm/email-senator-carper
Christopher Coons (Democrat)
Class II
127A RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-5042
Contact: www.coons.senate.gov/contact/
FLORIDA
Bill Nelson (Democrat)
Class I
716 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-5274
Contact: www.billnelson.senate.gov/contact/index.cfm
Marco Rubio (Republican)
Class III
317 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-3041
Contact: www.rubio.senate.gov/public/index.cfm/contact
GEORGIA
Saxby Chambliss (Republican)
Class II
416 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-3521
Contact: www.chambliss.senate.gov/public/index.cfm?p=Email
Johnny Isakson (Republican)
Class III
131 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-3643
Contact: www.isakson.senate.gov/public/index.cfm/email-me
ILLINOIS
Richard Durbin (Democrat)
Class II
711 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-2152
Contact: www.durbin.senate.gov/public/index.cfm/contact
Mark Kirk (Republican)
Class III
524 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-2854
Contact: www.kirk.senate.gov/?p=contact
KENTUCKY
Mitch McConnell (Republican)
Class II
317 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-2541
Contact: www.mcconnell.senate.gov/public/index.cfm?p=contact
Rand Paul (Republican)
Class III
208 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4343
Contact: www.paul.senate.gov/?p=contact
LOUISIANA
Mary Landrieu (Democrat)
Class II
703 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-5824
Contact: www.landrieu.senate.gov/?p=contact
David Vitter (Republican)
Class III
516 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4623
Contact: www.vitter.senate.gov/contact
MARYLAND
Benjamin Cardin (Democrat)
Class I
509 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4524
Contact: www.cardin.senate.gov/contact/
Barbara Mikulski (Democrat)
Class III
503 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4654
Contact: www.mikulski.senate.gov/contact/
MASSACHUSETTS
William Cowan (Democrat)
Class II
365 DIRKSEN SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-2742
Contact: www.cowan.senate.gov/contact
Elizabeth Warren (Democrat)
Class I
2 RUSSELL COURTYARD WASHINGTON DC 20510
Phone: (202) 224-4543
Contact: www.warren.senate.gov/contact.cfm
MICHIGAN
Carl Levin (Democrat)
Class II
269 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-6221
Contact: www.levin.senate.gov/contact/
Debbie Stabenow (Democrat)
Class I
133 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4822
Contact: www.stabenow.senate.gov/?p=contact
MISSISSIPPI
Thad Cochran (Republican)
Class II
113 DIRKSEN SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-5054
Contact:Contact: www.cochran.senate.gov/public/index.cfm/email-me
Roger Wicker (Republican)
Class I
555 DIRKSEN SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-6253
Contact: www.wicker.senate.gov/public/index.cfm?FuseAction=Contact…
MISSOURI
Roy Blunt (Republican)
Class III
260 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-5721
Contact: www.blunt.senate.gov/public/index.cfm/contact-form?p=cont…
Claire McCaskill (Democrat)
Class I
506 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-6154
Contact: www.mccaskill.senate.gov/?p=contact
NEW YORK
Kirsten Gillibrand (Democrat)
Class I
478 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4451
Contact: www.gillibrand.senate.gov/contact/
Charles Schumer (Democrat)
Class III
322 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-6542
Contact: www.schumer.senate.gov/Contact/contact_chuck.cfm
NORTH CAROLINA
Richard Burr (Republican)
Class III
217 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-3154
Contact: www.burr.senate.gov/public/index.cfm?FuseAction=Contact.C…
Kay Hagan (Democrat)
Class II
521 DIRKSEN SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-6342
Contact: www.hagan.senate.gov/?p=contact
OHIO
Sherrod Brown (Democrat)
Class I
713 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-2315
Contact: www.brown.senate.gov/contact/
Rob Portman (Republican)
Class III
338 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-3353
Contact: www.portman.senate.gov/public/index.cfm/contact?p=contact…
OKLAHOMA
Tom Coburn (Republican)
Class III
172 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-5754
Contact: www.coburn.senate.gov/public/index.cfm/contactsenatorcobu…
James Inhofe (Republican)
Class II
205 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4721
Contact: www.inhofe.senate.gov/public/index.cfm?FuseAction=Contact…
PENNSYLVANIA
Robert Casey (Democrat)
Class I
393 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-6324
Contact: www.casey.senate.gov/contact/
Patrick Toomey (Republican)
Class III
502 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4254
Contact: www.toomey.senate.gov/?p=contact
SOUTH CAROLINA
Lindsey Graham (Republican)
Class II
290 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-5972
Contact: www.lgraham.senate.gov/public/index.cfm?FuseAction=Contac…
Tim Scott (Republican)
Class III
167 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-6121
Contact: www.scott.senate.gov/contact.cfm
TENNESSEE
Lamar Alexander (Republican)
Class II
455 DIRKSEN SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4944
Contact: www.alexander.senate.gov/public/index.cfm?p=Email
Bob Corker (Republican)
Class I
425 DIRKSEN SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-3344
Contact: www.corker.senate.gov/public/index.cfm?p=ContactMe
TEXAS
John Cornyn (Republican)
Class II
517 HART SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-2934
Contact: www.cornyn.senate.gov/public/index.cfm?p=ContactForm
Ted Cruz (Republican)
Class I
B40B DIRKSEN SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-5922
Contact: www.cruz.senate.gov/contact.cfm
VIRGINIA
Tim Kaine (Democrat)
Class I
B40C DIRKSEN SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-4024
Contact: www.kaine.senate.gov/contact.cfm
Mark Warner (Democrat)
Class II
475 RUSSELL SENATE OFFICE BUILDING WASHINGTON DC 20510
Phone: (202) 224-2023
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