Long Grove, IL has a population of 8,017 and is the 4,647th largest city in the United States. The population density is 643 per sq mi which is 178% higher than the Illinois average and 610% 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, 69% of the population over 15 years of age are married, 75% speak English and 3% speak Spanish. 57% of Long Grove residents were born in Illinois, 21% were born out of state, 1% were born outside of the United States and 21% were foreign born.