FIPS Code 17199 State Illinois Website https://williamsoncountyil.gov/ Zoning Authority Zoning Jurisdiction Other Notes Solar ordinance, building permit application requirements ordinance, and a subdivision ordinance. Latest Verified PDF 17199_Williamson _20230117_0.pdf (10.23 MB) Solar Solar Principal Use Yes Solar Accessory Use No Wind Wind Principal Use No Wind Accessory Use No Date of Last Verification Tue, 01/17/2023 - 12:00