40 ILCS 5/21-102.10

"Governing body" means: (a) in cities, the city council; (b) in villages or incorporated towns, the board of trustees; (c) in townships, the town clerk for purposes of receiving petitions, the electors for purposes of the election of social security coverage, and the board of town trustees for all other purposes; (d) in other political subdivisions, the corporate authority, body or officer authorized by law to levy taxes for the maintenance and operation of the political subdivision; (e) in political subdivisions without the authority to levy taxes and in noncorporate public entities, the person or group of persons having ultimate authority to expend funds for the payment of earnings to employees.