Gilboa, OH has a population of 159 and is the 25,437th largest city in the United States. The population density is 1,065 per sq mi which is 314% higher than the Ohio average and 1075% higher than the national average. The median age in Gilboa is 34 which is approximately 15% lower than the Ohio average of 39. In Gilboa, 63% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 85% of Gilboa residents were born in Ohio, 15% were born out of state, 0% were born outside of the United States and 0% were foreign born.