Chelsea is a town in Rogers County, Oklahoma, United States. The population was 2,136 at the 2000 census.
Chelsea is located at 36°32′8″N 95°25′53″W / 36.53556°N 95.43139°W / 36.53556; -95.43139 (36.535544, -95.431466). According to the United States Census Bureau, the city has a total area of 1.7 square miles (4.4 km²), all of it land.
As of the census of 2000, there were 2,136 people, 835 households, and 539 families residing in the city. The population density was 1,267.4 people per square mile (488.0/km²). There were 961 housing units at an average density of 570.2 per square mile (219.6/km²). The racial makeup of the city was 64.93% White, 25.70% Native American, 0.33% Asian, 0.09% Pacific Islander, 0.09% from other races, and 8.85% from two or more races. Hispanic or Latino of any race were 0.89% of the population.