According to the United States Census Bureau, the city has a total area of 5.96 square miles (15.44 km2), of which, 5.95 square miles (15.41 km2) are land and 0.01 square miles (0.03 km2) is water. As of the census of 2010, 7,126 people, 3,291 households, and 1,937 families resided in the city. The population density was 1,197.6 inhabitants per square mile (462.4/km2). The 3,560 housing units averaged 598.3 per square mile (231.0/km2).
Gig Harbor has a marine west coast climate: Warm and dry summers, transitional springs and autumns, and cool and wet winters, with occasional snow. The annual high and low temperatures of Gig Harbor are 59.3 °F and 44.8 °F, respectively, making for an average of 52.05 °F.
Of the 3,291 households, 22.2% had children under the age of 18 living with them, 46.7% were married couples living together, 9.0% had a female householder with no husband present, 3.1% had a male householder with no wife present, and 41.1% were not families. About 34.2% of all households were made up of individuals, and 17.1% had someone living alone who was 65 years of age or older. The average household size was 2.12 and the average family size was 2.69.
The median age in the city was 48.1 years; 18% of residents were under the age of 18; 7% were 18 to 24; 21% were 25 to 44; 29% were 45 to 64; and 25% were 65 years of age or older. The gender makeup of the city was 46% male and 54% female. Source: (Wikipedia)