Quinlan is a rural city in the southern part of Hunt County, Texas, United States located within the US Government designated Dallas–Fort Worth metropolitan area.
As of the census of 2000, there were 1,370 people, 558 households, and 364 families residing in the city. Population density was 1,098.0 people per square mile (423.2/km²). There were 617 housing units at an average density of 494.5 per square mile (190.6/km²). The racial makeup of the city was 95.04% White, 0.66% African American, 0.58% Native American, 0.29% Asian, 2.34% from other races, and 1.09% from two or more races. Hispanic or Latino of any race were 5.18% of the population.
There were 558 households out of which 32.6% had children under the age of 18 living with them, 45.5% were married couples living together, 15.8% had a female householder with no husband present, and 34.6% were non-families. 30.6% of all households were made up of individuals and 15.6% had someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 3.07.