San Carlos (Western Apache: Sengaah[2]) is a census-designated place (CDP) in Gila County, Arizona, United States.

San Carlos' economy is underdeveloped and is based mainly on retail service industries, construction trades, and public administration.

[4] Its eastern border is the San Carlos River, which is also the Graham County line.

14.4% of all households were made up of individuals, and 2.7% had someone living alone who was 65 years of age or older.

San Carlos Apache Nnee Bich'o Nii Transit provides transportation on the reservation and to Safford and Globe.