Latham, IL has a population of 297 and is the 22,560th largest city in the United States. The population density is 1,067 per sq mi which is 380% higher than the Illinois average and 1077% higher than the national average. The median age in Latham is 43 which is approximately 16% higher than the Illinois average of 37. In Latham, 61% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 82% of Latham residents were born in Illinois, 16% were born out of state, 0% were born outside of the United States and 1% were foreign born.