Fredericksburg, OH has a population of 472 and is the 19,894th largest city in the United States. The population density is 1,398 per sq mi which is 443% higher than the Ohio average and 1443% higher than the national average. The median age in Fredericksburg is 34 which is approximately 13% lower than the Ohio average of 39. In Fredericksburg, 67% of the population over 15 years of age are married, 87% speak English and 0% speak Spanish. 90% of Fredericksburg residents were born in Ohio, 10% were born out of state, 0% were born outside of the United States and 0% were foreign born.