district                 vacator                                 reason for change                             successor                      date successor seated
0              new york 7th                  vacant  rep john j delaney died during previous congress                    louis b heller (d)                         february 15 , 1949
1             new york 20th           sol bloom (d)                               died march 7 , 1949  franklin delano roosevelt , jr (lib)                              may 17 , 1949
2             new york 10th     andrew l somers (d)                               died april 6 , 1949                      edna f kelly (d)                          november 8 , 1949
3         pennsylvania 26th     robert l coffey (d)                              died april 20 , 1949                     john p saylor (r)                        september 13 , 1949
4            california 5th     richard j welch (r)                          died september 10 , 1949                      john shelley (d)                          november 8 , 1949
5         massachusetts 6th      george j bates (r)                            died november 1 , 1949                   william h bates (r)                         february 14 , 1950
6              illinois 5th       martin gorski (d)                            died december 4 , 1949                                vacant  not filled for the remainder of this term
7              virginia 1st        s otis bland (d)                           died february 16 , 1950             edward j robeson , jr (d)                               may 2 , 1950
8             illinois 13th      ralph e church (r)                              died march 21 , 1950                                vacant  not filled for the remainder of this term
9             michigan 16th  john lesinski , sr (d)                                died may 27 , 1950                                vacant  not filled for the remainder of this term
10  north dakota at - large       william lemke (r)                                died may 30 , 1950                                vacant  not filled for the remainder of this term
11      north carolina 11th  alfred l bulwinkle (d)                             died august 31 , 1950                   woodrow w jones (d)                          november 7 , 1950

Table as JSON:
{"district":{"0":"new york 7th","1":"new york 20th","2":"new york 10th","3":"pennsylvania 26th","4":"california 5th","5":"massachusetts 6th","6":"illinois 5th","7":"virginia 1st","8":"illinois 13th","9":"michigan 16th","10":"north dakota at - large","11":"north carolina 11th"},"vacator":{"0":"vacant","1":"sol bloom (d)","2":"andrew l somers (d)","3":"robert l coffey (d)","4":"richard j welch (r)","5":"george j bates (r)","6":"martin gorski (d)","7":"s otis bland (d)","8":"ralph e church (r)","9":"john lesinski , sr (d)","10":"william lemke (r)","11":"alfred l bulwinkle (d)"},"reason for change":{"0":"rep john j delaney died during previous congress","1":"died march 7 , 1949","2":"died april 6 , 1949","3":"died april 20 , 1949","4":"died september 10 , 1949","5":"died november 1 , 1949","6":"died december 4 , 1949","7":"died february 16 , 1950","8":"died march 21 , 1950","9":"died may 27 , 1950","10":"died may 30 , 1950","11":"died august 31 , 1950"},"successor":{"0":"louis b heller (d)","1":"franklin delano roosevelt , jr (lib)","2":"edna f kelly (d)","3":"john p saylor (r)","4":"john shelley (d)","5":"william h bates (r)","6":"vacant","7":"edward j robeson , jr (d)","8":"vacant","9":"vacant","10":"vacant","11":"woodrow w jones (d)"},"date successor seated":{"0":"february 15 , 1949","1":"may 17 , 1949","2":"november 8 , 1949","3":"september 13 , 1949","4":"november 8 , 1949","5":"february 14 , 1950","6":"not filled for the remainder of this term","7":"may 2 , 1950","8":"not filled for the remainder of this term","9":"not filled for the remainder of this term","10":"not filled for the remainder of this term","11":"november 7 , 1950"}}