Texas Local Government Code - LOC GOV'T § 326.022. Territory Included in a District

(a) A district may include any contiguous territory within a single county.

(b) The district may include incorporated or unincorporated territory.

(c) If the boundaries of the proposed district include any territory that, on the date on which an election is ordered on the question of creating the district, is part of a municipality that operated a municipal public library, then the governing authority of that municipality must consent by resolution to allow the inclusion of that municipal territory in the proposed district.

(d) After a district is created, the district may not be expanded to include additional territory unless the commissioners court of the county in which the district is located calls and holds an election for that purpose in the territory to be added to the district. The commissioners court may not expand the district unless a majority of the voters voting at the expansion election approve the expansion of the district.