<Tr> <Td> July 10, 1890 </Td> <Td> 332 </Td> <Td> </Td> <Td> 26 Stat. 222 </Td> <Td> Wyoming admitted . </Td> </Tr> <Tr> <Td> March 4, 1893 </Td> <Td> 356 </Td> <Td> 24 </Td> <Td> 26 Stat. 735 </Td> <Td> Apportionment of the Eleventh Census . </Td> </Tr> <Tr> <Td> January 4, 1896 </Td> <Td> 357 </Td> <Td> </Td> <Td> 28 Stat. 109 </Td> <Td> Utah admitted . </Td> </Tr> <Table> <Tr> <Th> Date </Th> <Th> Size </Th> <Th> Change </Th> <Th> Citation </Th> <Th> Comments </Th> </Tr> <Tr> <Td> March 4, 1903 </Td> <Td> 386 </Td> <Td> 29 </Td> <Td> 31 Stat. 733 </Td> <Td> Apportionment of the Twelfth Census </Td> </Tr> <Tr> <Td> November 16, 1907 </Td> <Td> 391 </Td> <Td> 5 </Td> <Td> 34 Stat. 271 </Td> <Td> Oklahoma admitted </Td> </Tr> <Tr> <Td> January 6, 1912 </Td> <Td> 393 </Td> <Td> </Td> <Td> 37 Stat. 14 (Apportionment Act of 1911) </Td> <Td> New Mexico admitted </Td> </Tr> <Tr> <Td> February 14, 1912 </Td> <Td> 394 </Td> <Td> </Td> <Td> 37 Stat. 14 (Apportionment Act of 1911) </Td> <Td> Arizona admitted </Td> </Tr> <Tr> <Td> March 4, 1913 </Td> <Td> 435 </Td> <Td> 41 </Td> <Td> 37 Stat. 13 (Apportionment Act of 1911) </Td> <Td> Apportionment of the Thirteenth Census </Td> </Tr> <Tr> <Td> March 4, 1933 </Td> <Td> 435 </Td> <Td> </Td> <Td> 46 Stat. 26 (Reapportionment Act of 1929) </Td> <Td> Apportionment of the Fifteenth Census </Td> </Tr> <Tr> <Td> January 3, 1943 </Td> <Td> 435 </Td> <Td> </Td> <Td> 46 Stat. 26 (Reapportionment Act of 1929) 54 Stat. 162 </Td> <Td> Apportionment of the Sixteenth Census </Td> </Tr> </Table>

After each census the us senate is reapportioned