Section 70 ILCS 1205/3-6d - Disconnection-County with population of more than 250,000 but less than 1,000,000(a) This Section applies only in a park district located in whole or in part within a county with a population of more than 250,000 but less than 1,000,000.(b) A contiguous area of land containing one or more tracts may be disconnected from the district if (1) the area contains 20 acres or more in the aggregate, (2) the area is located on the border of the district, (3) disconnection will not cause any part of the district to be isolated from the rest of the district, and (4) the district has levied taxes in a total amount of less than $10,000 for each of the 5 previous years.(c) The owner or owners of record of the area must file a petition in the circuit court of the county in which the land is situated alleging facts in support of the disconnection. If the area is located in 2 or more counties, the petition must be filed in the circuit court of the county in which the largest portion of the area is located. The district from which disconnection is sought shall be made a defendant, and it or any taxpayer residing in the district may appear and defend against the petition. If the court finds that the allegations of the petition are true and that the area is entitled to disconnection, it shall order the area disconnected from the district.