Lake Petersburg, IL has a population of 649 and is the 17,930th largest city in the United States. The population density is 368 per sq mi which is 66% higher than the Illinois average and 306% higher than the national average. The median age in Lake Petersburg is 62 which is approximately 65% higher than the Illinois average of 37. In Lake Petersburg, 84% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 79% of Lake Petersburg residents were born in Illinois, 18% were born out of state, 3% were born outside of the United States and 0% were foreign born.
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The population density in Lake Petersburg is 66% higher than Illinois.
The median age in Lake Petersburg is 65% higher than Illinois.
In Lake Petersburg 96.92% of the population is White.
In Lake Petersburg 0.00% of the population is Black or African American.
In Lake Petersburg 3.08% of the population is Asian.