65 ILCS 5/4-3-8

At the same time that one files his statement of candidacy he shall also file with the clerk specified in Section 4-3-7 a petition requesting his candidacy. Such petition shall contain a number of signatures of electors, residing within the same municipality as the candidate, equal to at least 1% of the total vote cast at the last preceding election in the municipality for mayor. This petition shall be in substantially the form provided in the general election law.