Oak is located in southeast Nebraska. Oak is between the Nuckolls, Thayer county. Oak has 0.15 square miles of land area and has no water area. As of 2010-2014, the total Oak population is 40, which has shrunk 33.33% since 2000. The population growth rate is much lower than the state average rate of 8.44% and is much lower than the national average rate of 11.61%. Oak median household income is $31,667 in 2010-2014 and has grown by 44.76% since 2000. The income growth rate is higher than the state average rate of 33.50% and is much higher than the national average rate of 27.36%. Oak median house value is $30,000 in 2010-2014 and has grown by 200.03% since 2000. The house value growth rate is much higher than the state average rate of 47.84% and is much higher than the national average rate of 46.91%. As a reference, the national Consumer Price Index (CPI) inflation rate for the same period is 26.63%. On average, the public school district that covers Oak is close to the state average in quality. The Oak area code is 402.