Millerton, OK has a population of 258 and is the 23,275th largest city in the United States. The population density is 146 per sq mi which is 167% higher than the Oklahoma average and 61% higher than the national average. The median age in Millerton is 48 which is approximately 34% higher than the Oklahoma average of 36. In Millerton, 69% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 62% of Millerton residents were born in Oklahoma, 38% were born out of state, 0% were born outside of the United States and 0% were foreign born.