Source:
https://www.ncsl.org/redistricting-and-census/redistricting-criteriaCongressional districts do not have to be contiguous in Arkansas, Connecticut, Illinois, Indiana, Maryland, Massachusetts, New Hampshire, New Jersey, Tennessee, Texas, and Wisconsin. There appears to be no federal statute or court case specifying that Congressional districts be contiguous.
Theoretically, there is nothing stopping any of these state legislatures from engineering Congressional maps that feature non-contiguous districts.
