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Prof. Justin Levitt's Doug Spencer's Guide to Drawing the Electoral Lines
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Maps across the 2010 cycle

Congress         State Senate      State House / Assembly

 

This is when the state Senate maps across the country were put in place during the 2010 cycle.

State Drawn by Party control Finalized Effective start End date
Alabama Legislature
Legislature
Legislature		 Democratic
Republican
Republican		 7/3/01
5/31/12
5/19/17		 10/15/01
10/5/12
5/19/17		 10/5/12
5/19/17
active		 Superseded
Struck by federal court
Alaska Independent commission
Independent commission
Independent commission		 Republican
Republican
Republican		 6/13/11
5/22/12
7/14/13		 10/11/11
6/27/12
7/14/13		 6/27/12
7/14/13
active		 Struck by state court
Struck by state court
Arizona Independent commission Split 1/17/12 4/26/12 active
Arkansas Politician commission Democratic 7/29/11 7/29/11 active
California Independent commission Split 8/15/11 8/15/11 active
Colorado Politician commission
Politician commission		 Uncertain
Uncertain		 9/19/11
12/12/11		 9/19/11
12/12/11		 12/12/11
active		 Struck by state court
Connecticut Backup commission Split 11/30/11 11/30/11 active
Delaware Legislature Democratic 7/8/11 7/8/11 active
Florida Legislature
Legislature
State court		 Republican
Republican
n/a		 2/9/12
3/27/12
1/5/16		 2/9/12
4/30/12
1/5/16		 4/30/12
1/5/16
active		 Struck by state court
Struck by state court
Georgia Legislature
Legislature		 Republican
Republican		 8/24/11
4/13/12		 12/23/11
1/1/14		 12/31/13
active		 Superseded
Hawaii Politician commission
Politician commission		 Split
Split		 9/26/11
3/8/12		 9/26/11
3/8/12		 3/8/12
active		 Struck by state court
Idaho Independent commission
Independent commission		 Split
Split		 10/14/11
1/27/12		 10/14/11
1/27/12		 1/27/12
active		 Struck by state court
Illinois Legislature Democratic 6/3/11 6/3/11 active
Indiana Legislature Republican 5/10/11 5/10/11 active
Iowa Legislature Split 4/19/11 4/19/11 active
Kansas Federal court n/a 6/7/12 6/7/12 active
Kentucky Legislature
Legislature
Legislature		 Split
Split
Split		 1/20/12
1/31/02
8/23/13		 1/20/12
2/7/12
8/23/13		 2/7/12
8/23/13
active		 Struck by state court
Superseded
Louisiana Legislature Republican 4/14/11 6/28/11 active
Maine State court
Legislature		 n/a
Split		 7/2/03
6/14/13		 7/2/03
6/14/13		 6/14/13
active		 Superseded
Maryland Governor Democratic 2/24/12 2/24/12 active
Massachusetts Legislature Democratic 11/3/11 11/3/11 active
Michigan Legislature Republican 8/9/11 2/28/12 active
Minnesota State court n/a 2/21/12 2/21/12 active
Mississippi Legislature
Legislature
Legislature		 Democratic
Republican
Republican		 3/26/02
5/3/12
3/27/19		 6/17/02
9/14/12
8/1/19		 9/14/12
8/1/19
active		 Superseded
Struck by federal court
Missouri Backup commission
Politician commission		 n/a
Split		 12/9/11
3/12/12		 12/9/11
3/12/12		 3/12/12
active		 Struck by state court
Montana Independent commission
Independent commission		 Split
Split		 2/5/03
2/12/13		 2/5/03
2/12/13		 2/12/13
active		 Superseded
Nebraska Legislature Nonpartisan 5/26/11 5/26/11 active
Nevada State court n/a 10/27/11 10/27/11 active
New Hampshire Legislature Republican 3/23/12 6/1/12 active
New Jersey Politician commission Split 4/3/11 4/3/11 active
New Mexico State court n/a 1/16/12 1/16/12 active
New York Legislature Split 3/27/12 4/27/12 active
North Carolina Legislature
Federal court
Legislature		 Republican
n/a
Republican		 7/27/11
1/21/18
10/28/19		 11/1/11
1/21/18
10/28/19		 1/21/18
10/28/19
active		 Struck by federal court
Struck by state court
North Dakota Legislature Republican 11/9/11 11/9/11 active
Ohio Politician commission Republican 9/28/11 9/28/11 active
Oklahoma Legislature Republican 5/20/11 5/20/11 active
Oregon Legislature Split 6/13/11 6/13/11 active
Pennsylvania Politician commission
Politician commission
Politician commission		 Split
Split
Split		 12/12/11
12/28/01
6/8/12		 12/12/11
1/25/12
5/8/13		 1/25/12
5/8/13
active		 Struck by state court
Superseded
Rhode Island Legislature Democratic 2/8/12 2/8/12 active
South Carolina Legislature Republican 6/28/11 11/14/11 active
South Dakota Legislature Republican 10/25/11 1/19/12 active
Tennessee Legislature Republican 2/9/12 2/14/12 active
Texas Legislature
Federal court		 Republican
n/a		 6/17/11
2/28/12		 6/17/11
2/28/12		 2/28/12
active		 Struck by federal court
Utah Legislature
Legislature		 Republican
Republican		 10/20/11
1/30/12		 10/20/11
1/30/12		 1/30/12
active		 Superseded
Vermont Legislature Democratic 5/1/12 5/1/12 active
Virginia Legislature Split 4/29/11 6/17/11 active
Washington Legislature Split 2/1/12 2/1/12 active
West Virginia Legislature Democratic 8/18/11 8/18/11 active
Wisconsin Legislature Republican 8/9/11 8/9/11 active
Wyoming Legislature Republican 3/6/12 3/6/12 active