2020 census As of the
2020 census, Gambrills had a population of 3,034. The median age was 42.8 years. 21.1% of residents were under the age of 18 and 15.6% of residents were 65 years of age or older. For every 100 females there were 98.0 males, and for every 100 females age 18 and over there were 97.8 males age 18 and over. 58.5% of residents lived in urban areas, while 41.5% lived in rural areas. There were 1,055 households in Gambrills, of which 39.5% had children under the age of 18 living in them. Of all households, 66.9% were married-couple households, 12.5% were households with a male householder and no spouse or partner present, and 15.1% were households with a female householder and no spouse or partner present. About 15.1% of all households were made up of individuals and 6.2% had someone living alone who was 65 years of age or older. There were 1,079 housing units, of which 2.2% were vacant. The homeowner vacancy rate was 0.1% and the rental vacancy rate was 2.9%.
Demographic estimates Unincorporated Gambrills has an estimated population of 3,185 as of 2021. In 2022, the population of the CDP was 2,837.
Income and poverty The median-income of residents was $140,238. ==Transportation==