Grand Ridge, IL has a population of 588 and is the 18,557th largest city in the United States. The population density is 1,274 per sq mi which is 473% higher than the Illinois average and 1306% higher than the national average. The median age in Grand Ridge is 39 which is approximately 4% higher than the Illinois average of 37. In Grand Ridge, 65% of the population over 15 years of age are married, 96% speak English and 4% speak Spanish. 85% of Grand Ridge residents were born in Illinois, 13% were born out of state, 0% were born outside of the United States and 2% were foreign born.