55 ILCS 5/5-32001
Any county may make a local improvement outside of a municipality, as defined in Section 1-1-2 of the "Illinois Municipal Code", whenever the public necessity requires such improvement, subject only to the limitations prescribed in this Division. This Division shall not be construed as repealing any other laws with respect to county government, but shall be considered as an additional grant of power for the purposes herein set out. Any number of streets, avenues, lanes or alleys, sidewalks, or any other public places, or parts thereof, or private roads or streets, in platted subdivisions of the county to be improved may be included in one proceeding, as provided in this Division, even though they may be intersected by previously improved streets, avenues, roads or alleys which are not included in the proceeding, where they are contiguous or part of a connected system with reciprocal benefits. This Division shall not be construed to limit the powers of municipalities contained in Article 11 of the Illinois Municipal Code.
55 ILCS 5/5-32001