(a) If a county, voting district, tract, block group or block is not included within a congressional district established by this act, such county, voting district, tract, block group or block shall be attached to the congressional district to which such county, voting district, tract, block group or block is contiguous and, if contiguous to more than one congressional district, such county, voting district, tract, block group or block shall be attached to the contiguous congressional district that has the least total population.
(b) If a county, voting district, tract, block group or block is included in two or more congressional districts established by this act, such county, voting district, tract, block group or block shall be attached to and become a part of the congressional district that has the least total population.