Oak, NE has a population of 50 and is the 28,159th largest city in the United States. The population density is 329 per sq mi which is 1274% higher than the Nebraska average and 264% higher than the national average. The median age in Oak is 35 which is approximately 3% lower than the Nebraska average of 36. In Oak, 55% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 94% of Oak residents were born in Nebraska, 6% were born out of state, 0% were born outside of the United States and 0% were foreign born.