State
|
Incumbent
|
Results
|
Candidates
|
Senator
|
Party
|
Electoral history
|
Iowa
(Class 2)
|
James W. Grimes
|
Republican
|
1858
1864
|
Incumbent resigned December 6, 1869 due to ill health.
State readmitted to the Union.
Winner
elected
January 18, 1870
.
[3]
Winner did not seek election to the next term.
|
|
Maine
(Class 2)
|
Lot M. Morrill
|
Republican
|
1861
(special)
1863
1869
(Lost)
1869
(Appointed)
|
Interim appointee
elected
January 19, 1870
to finish the term.
Winner was also elected to the next term, see below.
|
|
Virginia
(Class 1)
|
Vacant since January 2, 1864,
when
Joseph Segar
(
U
) was not seated.
[4]
|
State readmitted to the Union.
Winner
elected
January 26, 1870
.
Republican gain
.
|
|
Virginia
(Class 2)
|
Vacant since March 4, 1865, when
John Curtiss Underwood
(
U
) was not seated.
[5]
|
State readmitted to the Union.
Winner
elected
January 26, 1870
.
Democratic gain
.
Winner was also elected late to the next term, see below.
|
|
Texas
(Class 2)
|
Vacant since July 11, 1861,
when
John Hemphill
(D) was expelled.
|
State readmitted to the Union.
Winner
elected
February 22, 1870
.
[6]
Allowed to take office when state readmitted on March 30, 1870.
Republican gain
.
Winner was also elected to the next term, see below.
|
|
Mississippi
(Class 1)
|
Vacant since January 21, 1861,
when
Jefferson Davis
(D) resigned
|
State readmitted to the Union.
Winner
elected
February 23, 1870
.
Republican gain
.
|
|
Mississippi
(Class 2)
|
Vacant since January 12, 1861,
when
Albert G. Brown
(D) withdrew.
|
State readmitted to the Union.
Winner
elected
February 23, 1870
.
Republican gain
.
Unknown if winner ran for the next term or retired, see below.
|
|
Texas
(Class 1)
|
Vacant since March 23, 1861,
when
Louis Wigfall
(D) withdrew.
|
State readmitted to the Union.
Winner
elected
March 30, 1870
.
Republican gain
.
|
|
Missouri
(Class 3)
|
Daniel T. Jewett
|
Republican
|
1870
(Appointed)
|
Interim appointee retired.
New senator elected
January 20, 1871
to finish the term.
Democratic gain
.
|
|
Minnesota
(Class 2)
|
William Windom
|
Republican
|
1865
|
Interim appointee was not elected to finish the term.
Winner
elected
January 22, 1871
to finish the term.
Republican hold.
Winner was not elected to the next term, see below.
Instead, interim appointee was elected to the next term, see below.
|
|
Georgia
(Class 3)
|
Vacant since January 28, 1861,
when
Alfred Iverson Sr.
(D) withdrew.
|
State readmitted to the Union.
Winner had been
elected
in 1867, but not seated until readmission.
Winner finally seated
February 1, 1871
.
Republican gain
.
|
|
Georgia
(Class 2)
|
Vacant since February 4, 1861,
when
Robert Toombs
(D) withdrew.
|
State readmitted to the Union.
Winner
elected
February 24, 1871
.
Democratic gain
.
Unknown if winner ran for the next term or retired, see below.
|
|