Hahnville, LA has a population of 3,514 and is the 8,029th largest city in the United States. The population density is 632 per sq mi which is 485% higher than the Louisiana average and 598% higher than the national average. The median age in Hahnville is 41 which is approximately 13% higher than the Louisiana average of 36. In Hahnville, 55% of the population over 15 years of age are married, 92% speak English and 5% speak Spanish. 85% of Hahnville residents were born in Louisiana, 12% were born out of state, 1% were born outside of the United States and 3% were foreign born.