Monterey, LA has a population of 400 and is the 20,879th largest city in the United States. The population density is 141 per sq mi which is 59% higher than the Louisiana average and 56% higher than the national average. The median age in Monterey is 33 which is approximately 8% lower than the Louisiana average of 36. In Monterey, 83% of the population over 15 years of age are married, 98% speak English and 2% speak Spanish. 55% of Monterey residents were born in Louisiana, 45% were born out of state, 0% were born outside of the United States and 0% were foreign born.