(a) The commissioners court shall order the clerk to post a copy of the petition together with the order of the commissioners court in five public places in the county, one of which shall be the courthouse door and four of which shall be in different places inside the limits of the proposed district. The notice shall be posted not less than 20 days before the time set for the hearing.
(b) If the district is composed of more than one county, a copy of the petition together with the order shall be posted at the courthouse door of each county in which any portion of the proposed district is located, and four copies shall be posted at four other places inside the included territory of each county.

(c) The clerk shall receive $1 as compensation for posting each notice and five cents a mile for each mile necessarily traveled in posting the notices.