Senate District 18 is composed on 21 counties (or parts thereof).  While an overwhelming number of the counties in SD-18 are rural in nature, most of the population of SD-18 lies in Fort Bend County.

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The counties include:

★Aransas

★Austin

★Burleson

★Calhoun

★Colorado

★DeWitt

★Fayette

★Fort Bend (western portion only)

★Goliad

★Gonzales

★ Harris (western portion only)

★Jackson

★Lavaca

★Lee

★Matagorda

★Nueces (eastern portion only)

★Refugio

★Victoria

★Waller

★Washington

★Wharton