Located southeast of Los Angeles, Orange, California is a small but well-known city located in the famous Orange County, California. The City of Orange is only 27 square miles. Its largest employers are primarily medical in nature including UC Irvine Medical Center, St Joseph Hospital and Children’s Hospital. One of the most famous facts about the city is that most of its buildings and houses were built prior to 1920. The Orange Historic District is the largest National Register District in California. Additionally, Orange has the second largest number of historic buildings in the Orange County region.