Coplin Plantation is a plantation in Franklin County, Maine, United States. The population was 135 at the 2000 census.

According to the United States Census Bureau, the plantation has a total area of 33.1 square miles (86 km²), all of it land.

As of the census of 2000, there were 135 people, 58 households, and 37 families residing in the plantation. The population density was 4.1 people per square mile (1.6/km²). There were 160 housing units at an average density of 4.8 per square mile (1.9/km²). The racial makeup of the plantation was 99.26% White, and 0.74% from two or more races.

There were 58 households out of which 34.5% had children under the age of 18 living with them, 53.4% were married couples living together, 5.2% had a female householder with no husband present, and 36.2% were non-families. 24.1% of all households were made up of individuals and 6.9% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 2.78.