(105 ILCS 5/3-14.18)
(from Ch. 122, par. 3-14.18)
Map - Numbering of districts.
To keep in his office a map of his county on a scale of not less than
two inches to the mile and to indicate thereon the boundary lines and
numbers of all school districts. Districts shall be numbered consecutively.
If a new district composed of parts of two or more counties is formed, the
county superintendents of such counties shall agree upon a number by which
the district shall be designated, which number shall not be a duplicate of
any number in either of such counties.
(Source: Laws 1961, p. 31.)