Old Towne, Orange Historic District, a one square-mile around the original plaza of Orange, California, contains many of the original structures built in the period after the City's incorporation. It is a vibrant commercial district, containing Orange County's oldest operating bank and the oldest operating soda fountain. The Historic District was listed on the National Register of Historic Places in 1997, and is the largest National Register District in California. The Old Towne Preservation Association is a non-profit organization dedicated to maintaining the district.
The district is home to the Orange International Street Fair, which has been held annually every Labor Day weekend since 1973. The inaugural event was held to celebrate the city's centennial and pay homage to the original 1910 Orange Street Fair. The Fair's success led to the city holding the event annually ever since. The event covers the Plaza, West and East Chapman Avenue, and North and South Glassell Street, and features international food and drink, live music and entertainment, and showcases for local businesses and non-profit organizations. The event typically draws several hundred thousand attendees over the course of the weekend.