Hallett, OK has a population of 129 and is the 26,191st largest city in the United States. The population density is 145 per sq mi which is 166% higher than the Oklahoma average and 61% higher than the national average. The median age in Hallett is 39 which is approximately 7% higher than the Oklahoma average of 36. In Hallett, 69% of the population over 15 years of age are married, 98% speak English and 2% speak Spanish. 65% of Hallett residents were born in Oklahoma, 33% were born out of state, 2% were born outside of the United States and 0% were foreign born.