Romblon separated from Capiz
American colonial era
Upon the restoration of peace and order in the province following the Philippine–American War, the Americans established civilian government in the islands on 16 March 1901. Romblon was created as a regular province in the same year but due to insufficient income, it became a sub-province of Capiz again from 15 July 1907 until 22 February 1918, when Act No. 2724 reestablished the province. Under Commonwealth Act No. 581, enacted without executive approval on 8 June 1940, the province was reorganized with four towns or municipalities, namely: Tablas (composed of Odiongan, Looc, and Badajoz), Romblon (including the islands of Logbon, Cobrador and Alad), Maghali (comprising Banton, Corcuera, and Concepcion), and Sibuyan (composed of the towns of Cajidiocan, Magdiwang and San Fernando).