Valid Illinois SSN Group Numbers


The middle two numbers in a social security number (SSN) are known as the group number. These numbers may range from 1 to 99, but are not assigned in consecqutive order. Also, depending on the area number, only a certain range of group numbers may have already been assigned. This information can be used to determine if a SSN is valid or not. The current valid group numbers for group number 345 are given below. 345 SSN's issued since 1972 belong to the state of Illinois; .