The district was created under the 1916 Jones Law from the western Visayas provinces of Capiz and Iloilo.
Romblon was added in 1917 upon its re-establishment as a regular province separate from Capiz.
[1] The district was represented by a total of eight senators throughout its existence.
It was abolished in 1935 when a unicameral National Assembly was installed under a new constitution following the passage of the Tydings–McDuffie Act which established the Commonwealth of the Philippines.
It was last represented by Ruperto Montinola and Potenciano Treñas of the Nacionalista Demócrata Pro-Independencia.