60 ILCS 1/5-25

If it appears by the returns of the election that a majority of the legal voters of the county are for township organization, then, the county so voting in favor of adopting township organization shall be governed by and subject to the provisions of this Code on and after the first Tuesday of April of the next succeeding odd-numbered year. A majority of the voters voting at the election shall be deemed a majority of the voters of the county.