Oakbrook, KY has a population of 8,640 and is the 4,405th largest city in the United States. The population density is 2,720 per sq mi which is 2409% higher than the Kentucky average and 2902% higher than the national average. The median age in Oakbrook is 42 which is approximately 9% higher than the Kentucky average of 39. In Oakbrook, 65% of the population over 15 years of age are married, 95% speak English and 2% speak Spanish. 51% of Oakbrook residents were born in Kentucky, 45% were born out of state, 1% were born outside of the United States and 3% were foreign born.