district                              vacator                             reason for change                  successor      date successor seated
0   massachusetts 4th                 joseph b varnum (dr)  resigned june 29 , 1811 to become us senator  william m richardson (dr)   seated november 4 , 1811
1        virginia 8th                 john hungerford (dr)    lost contested election november 29 , 1811       john taliaferro (dr)  seated november 29 , 1811
2  north carolina 3rd                   thomas blount (dr)                        died february 7 , 1812       william kennedy (dr)   seated january 30 , 1813
3        new york 6th         robert le roy livingston (f)                         resigned may 6 , 1812     thomas p grosvenor (f)   seated january 29 , 1813
4  missouri territory  territory delegate seat established           territory delegate seat established           edward hempstead   seated november 9 , 1812
5  illinois territory  territory delegate seat established           territory delegate seat established              shadrach bond   seated december 3 , 1812

Table as JSON:
{"district":{"0":"massachusetts 4th","1":"virginia 8th","2":"north carolina 3rd","3":"new york 6th","4":"missouri territory","5":"illinois territory"},"vacator":{"0":"joseph b varnum (dr)","1":"john hungerford (dr)","2":"thomas blount (dr)","3":"robert le roy livingston (f)","4":"territory delegate seat established","5":"territory delegate seat established"},"reason for change":{"0":"resigned june 29 , 1811 to become us senator","1":"lost contested election november 29 , 1811","2":"died february 7 , 1812","3":"resigned may 6 , 1812","4":"territory delegate seat established","5":"territory delegate seat established"},"successor":{"0":"william m richardson (dr)","1":"john taliaferro (dr)","2":"william kennedy (dr)","3":"thomas p grosvenor (f)","4":"edward hempstead","5":"shadrach bond"},"date successor seated":{"0":"seated november 4 , 1811","1":"seated november 29 , 1811","2":"seated january 30 , 1813","3":"seated january 29 , 1813","4":"seated november 9 , 1812","5":"seated december 3 , 1812"}}