district                     vacator                  reason for change                 successor     date successor seated
0                     missouri 5th         john g miller ( o )                 died may 11 , 1856     thomas p akers ( kn )   seated august 18 , 1856
1                     virginia 1st        thomas h bayly ( d )                died june 23 , 1856  muscoe r h garnett ( d )  seated december 1 , 1856
2  new mexico territory at - large       josã m gallegos ( d )  contested election july 23 , 1856      miguel a otero ( d )     seated july 23 , 1856
3                      vermont 1st         james meacham ( o )              died august 23 , 1856     george t hodges ( r )  seated december 1 , 1856
4                     illinois 5th  william a richardson ( d )          resigned august 25 , 1856       jacob c davis ( d )  seated november 4 , 1856
5               south carolina 4th        preston brooks ( d )             died january 28 , 1857                    vacant      not filled this term
6                    new york 20th    orsamus b matteson ( o )        resigned february 27 , 1857                    vacant      not filled this term
7                    new york 23rd     william a gilbert ( o )        resigned february 27 , 1857                    vacant      not filled this term

Table as JSON:
{"district":{"0":"missouri 5th","1":"virginia 1st","2":"new mexico territory at - large","3":"vermont 1st","4":"illinois 5th","5":"south carolina 4th","6":"new york 20th","7":"new york 23rd"},"vacator":{"0":"john g miller ( o )","1":"thomas h bayly ( d )","2":"josã m gallegos ( d )","3":"james meacham ( o )","4":"william a richardson ( d )","5":"preston brooks ( d )","6":"orsamus b matteson ( o )","7":"william a gilbert ( o )"},"reason for change":{"0":"died may 11 , 1856","1":"died june 23 , 1856","2":"contested election july 23 , 1856","3":"died august 23 , 1856","4":"resigned august 25 , 1856","5":"died january 28 , 1857","6":"resigned february 27 , 1857","7":"resigned february 27 , 1857"},"successor":{"0":"thomas p akers ( kn )","1":"muscoe r h garnett ( d )","2":"miguel a otero ( d )","3":"george t hodges ( r )","4":"jacob c davis ( d )","5":"vacant","6":"vacant","7":"vacant"},"date successor seated":{"0":"seated august 18 , 1856","1":"seated december 1 , 1856","2":"seated july 23 , 1856","3":"seated december 1 , 1856","4":"seated november 4 , 1856","5":"not filled this term","6":"not filled this term","7":"not filled this term"}}