thumb|Photo of Newcastle, Oklahoma before and after expansion of Main Street / Highway 62 to 4 lanesCotton, ranching, and the dairy industry, once important to the local economy, declined with subdivisions and commercial development taking over former agricultural lands. At the end of the twentieth century the public school system was Newcastle's largest employer. The 2010 census recorded 7,685 residents and the population is estimated to be over 10,000 by 2020.
thumb|Photo of Newcastle, Oklahoma before and after expansion of Main Street / Highway 62 to 4 lanesCotton, ranchi.ng, and the dairy industry, once important to the local economy, declined with subdivisions and commercial development taking over former agricultural lands. At the end of the twentieth century the public school system was Newcastle's largest employer The 2010 census recorded 7685 residents and the population is estimated to be over 10000 by 2020