Although Gold Beach had been a community since the middle of the 19th century, and the county seat since 1859, its current incorporation charter only dates to 1945.
According to the United States Census Bureau, the city has a total area of 2.5 square miles (6.5 km²), of which, 2.3 square miles (6.0 km²) of it is land and 0.2 square miles (0.5 km²) of it (7.54%) is water.
There were 829 households out of which 24.4% had children under the age of 18 living with them, 48.7% were married couples living together, 10.3% had a female householder with no husband present, and 38.5% were non-families. 33.2% of all households were made up of individuals and 14.7% had someone living alone who was 65 years of age or older. The average household size was 2.19 and the average family size was 2.75.
In the city the population was spread out with 21.0% under the age of 18, 6.2% from 18 to 24, 23.4% from 25 to 44, 30.5% from 45 to 64, and 19.0% who were 65 years of age or older. The median age was 45 years. For every 100 females there were 92.4 males. For every 100 females age 18 and over, there were 91.2 males.
The median income for a household in the city was $30,243, and the median income for a family was $37,634. Males had a median income of $31,083 versus $23,512 for females. The per capita income for the city was $16,717. About 8.8% of families and 12.4% of the population were below the poverty line, including 12.8% of those under age 18 and 6.9% of those age 65 or over.