Long Grove, IL has a population of 8,065 and is the 4,652nd largest city in the United States. The population density is 656 per sq mi which is 195% higher than the Illinois average and 624% higher than the national average. The median age in Long Grove is 44 which is approximately 18% higher than the Illinois average of 37. In Long Grove, 65% of the population over 15 years of age are married, 71% speak English and 4% speak Spanish. 56% of Long Grove residents were born in Illinois, 18% were born out of state, 1% were born outside of the United States and 25% were foreign born.