Fort Irwin is not actually a city, but rather a United States Army facility located in San Bernardino County, California. It is a National Training Center where soldiers and military units train for combat scenarios. The facility covers an area of approximately 1,000 square miles and is home to various training facilities, as well as residential areas for military personnel and their families. The nearest city to Fort Irwin is Barstow, which is about 37 miles to the northwest.