As of the census of 2010, there were 3,866 people, 1,640 households, and 1,036 families living in the city. The population density was. There were 1,828 housing units at an average density of. The racial makeup of the city was 92.5% White, 0.4% African American, 1.9% Native American, 0.5% Asian, 0.1% Pacific Islander, 1.7% from other races, and 2.9% from two or more races. Hispanic or Latino of any race were 5.3% of the population. There were 1,640 households of which 26.7% had children under the age of 18 living with them, 48.0% were married couplesliving together, 11.3% had a female householder with no husband present, 3.9% had a male householder with no wife present, and 36.8% were non-families. 31.2% of all households were made up of individuals and 15.4% had someone living alone who was 65 years of age or older. The average household size was 2.30 and the average family size was 2.84. The median age in the city was 45.5 years. 20.7% of residents were under the age of 18; 7.6% were between the ages of 18 and 24; 21.2% were from 25 to 44; 29.9% were from 45 to 64; and 20.6% were 65 years of age or older. The gender makeup of the city was 48.8% male and 51.2% female.
2000 census
As of the census of 2000, there were 4,184 people, 1,686 households, and 1,129 families living in the city. The population density was 1,538.3 people per square mile. There were 1,850 housing units at an average density of 680.2 per square mile. The racial makeup of the city was 92.64% White, 0.50% African American, 1.77% Native American, 0.36% Asian, 0.14% Pacific Islander, 1.60% from other races, and 2.99% from two or more races. Hispanic or Latino of any race were 4.09% of the population. There were 1,686 households out of which 28.2% had children under the age of 18 living with them, 51.1% were married couples living together, 12.0% had a female householder with no husband present, and 33.0% were non-families. 28.1% of all households were made up of individuals and 14.8% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 2.83. In the city, the population dispersal was 22.9% under the age of 18, 7.4% from 18 to 24, 25.3% from 25 to 44, 24.1% from 45 to 64, and 20.1% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 94.3 males. For every 100 females age 18 and over, there were 91.8 males. The median income for a household in the city was $29,931, and the median income for a family was $35,144. Males had a median income of $34,583 versus $21,567 for females. The per capita income for the city was $14,619. About 7.6% of families and 10.6% of the population were below the poverty line, including 15.3% of those under age 18 and 6.1% of those age 65 or over.
The Coquille Valley Historical Society established the Coquille Valley Museum in May 2005. It features exhibits of tools, antiques, books, photographs, and other materials. On summer weekends, local volunteers perform in melodramas at the Sawdust Theatre in Coquille. First opened in 1966 and destroyed by fire in 1994, the theater reopened in 2000. The old City Hall, built in 1912, has been restored, by its owners, Nella and Steve Abbott, and transformed into a gallery featuring art created by prisoners.
