Prairieville, LA has a population of 29,732 and is the 1,444th largest city in the United States. The population density is 1,351 per sq mi which is 1423% higher than the Louisiana average and 1391% higher than the national average. The median age in Prairieville is 34 which is approximately 6% lower than the Louisiana average of 36. In Prairieville, 64% of the population over 15 years of age are married, 92% speak English and 5% speak Spanish. 77% of Prairieville residents were born in Louisiana, 20% were born out of state, 0% were born outside of the United States and 3% were foreign born.