70 ILCS 3610/3.01
Any municipality or county may be annexed to a District, other than a Metro East Transit District, formed pursuant to Section 3 when the District has no tax levy in effect and has no bonded indebtedness if a petition for annexation is adopted by an ordinance or resolution approved by a majority vote of the corporate authorities of such municipality or the county board of such county and such ordinance or resolution is approved by a 2/3 vote of the members of the board of trustees of the District. Upon the approval of such a petition of annexation by the board of trustees of a District, a certified copy of the ordinance of annexation shall be filed by the secretary of the board in the same manner as provided for upon creation of the District.
Any contiguous township of any county, not already participating in a Metro East Transit District, may be annexed to a Metro East Transit District formed by one county pursuant to Section 3 of this Act if a petition for annexation, which is signed by at least 10% of the registered voters in the last general election who are residents of the township to be annexed or approved by a majority vote of the township board of the township to be annexed, is adopted by resolution approved by a majority vote of the county board in which the District was formed and such resolution is approved by a 2/3 vote of the members of the board of trustees of the District. Upon the approval of such petition of annexation by the board of trustees of a District, a certified copy of the ordinance of annexation shall be filed by the secretary of the board in the same manner as provided for upon creation of the District.
70 ILCS 3610/3.01