Armstrong, OK has a population of 196 and is the 24,545th largest city in the United States. The population density is 2,198 per sq mi which is 3926% higher than the Oklahoma average and 2326% higher than the national average. The median age in Armstrong is 42 which is approximately 16% higher than the Oklahoma average of 36. In Armstrong, 85% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 66% of Armstrong residents were born in Oklahoma, 34% were born out of state, 0% were born outside of the United States and 0% were foreign born.