Portland is located in San Patricio County on the South Texas coastal plain, fronting on Corpus Christi Bay and Nueces Bay. As a summer and winter resor , Portland is blessed with her mild climate and prevailing bay breezes. A haven for sportsmen and active souls.
Just to add that the Portland City limit is contiguous with that of Corpus Christi. It is the gateway city into Corpus Christi and other points south is also called the "Gem City of the Gulf Coast" and the most attractive and pleasant spot in Texas