San Jose, IL has a population of 645 and is the 17,976th largest city in the United States. The population density is 1,289 per sq mi which is 480% higher than the Illinois average and 1323% higher than the national average. The median age in San Jose is 41 which is approximately 10% higher than the Illinois average of 37. In San Jose, 66% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 82% of San Jose residents were born in Illinois, 15% were born out of state, 0% were born outside of the United States and 3% were foreign born.