Niceville, FL has a population of 14,325 and is the 2,936th largest city in the United States. The population density is 1,067 per sq mi which is 263% higher than the Florida average and 1078% higher than the national average. The median age in Niceville is 37 which is approximately 10% lower than the Florida average of 42. In Niceville, 64% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 31% of Niceville residents were born in Florida, 59% were born out of state, 4% were born outside of the United States and 5% were foreign born.