Sulphur, LA has a population of 20,198 and is the 2,156th largest city in the United States. The population density is 1,803 per sq mi which is 1933% higher than the Louisiana average and 1890% higher than the national average. The median age in Sulphur is 35 which is approximately 3% lower than the Louisiana average of 36. In Sulphur, 60% of the population over 15 years of age are married, 93% speak English and 3% speak Spanish. 74% of Sulphur residents were born in Louisiana, 22% were born out of state, 1% were born outside of the United States and 3% were foreign born.