35 Ill. Adm. Code 276.302
Determination of Affected Counties
Section 276
Section 276.302
Determination of Affected Counties
a) The Agency shall make its determination of the geographic
extent of an affected county based upon the "UNITED STATES POSTAL SERVICE
ZIP + 4 National Directory File".
b) To the extent practicable, the Agency shall make its
determination of residency in an affected county so as to assure that:
1) irrespective of Zip Code, the affected counties correspond to
the geographic areas prescribed in the Vehicle Emissions Inspection Law, and
2) the affected counties are composed of contiguous geographic
areas within each of the counties.