Yep, OK is an energy-rich state, and that makes all the difference in judging real estate markets. So is Texas, Lousiana, Wyoming, Montana, Utah, even North Dakota…all with relatively healthy real estate markets.
Another factor is agriculture. Corn and soybean-producing areas have bouyant real estate and land markets. Farmland in the midwest has increased 20% per year lately, and many farmers are suddenly finding themselves millionaires & buying McMansions, big toys, etc.