Portland is a city in Nueces and San Patricio Counties in the U.S. state of Texas. Its population was 15,099 at the 2010 census.
Portland is located at 27°52′59″N 97°19′14″W (27.883117, -97.320466). According to the United States Census Bureau, the city has a total area of 9.6 sq mi (24.9 km2), of which 7.0 sq mi (18.1 km2) are land and 2.6 sq mi (6.8 km2) (27.44%) are covered by water. The city is roughly equidistant from Portland, Maine, and Portland, Oregon. In 2014 and 2015, the city annexed an additional 1.27 sq mi, bringing the total area to 10.87 sq mi.
As of the census of 2000, 14,827 people, 5,021 households, and 4,051 families were residing in the city. The population density was 2,125.5 people/sq mi (820.2/km2). The 5,351 housing units averaged 767.1sq mi (296.0/km2).
In 2017, the Texas Demographic Center estimated the population at 21,619.
Of the 5,021 households, 47.5% had children under the age of 18 living with them, 68.6% were married couples living together, 9.2% had a female householder with no husband present, and 19.3% were not families. About 16.1% of all households were made up of individuals, and 6.1% had someone living alone who was 65 years of age or older.