Trenton, MO has a population of 5,946 and is the 5,786th largest city in the United States. The population density is 922 per sq mi which is 968% higher than the Missouri average and 918% higher than the national average. The median age in Trenton is 37 which is approximately 4% lower than the Missouri average of 38. In Trenton, 66% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 75% of Trenton residents were born in Missouri, 23% were born out of state, 0% were born outside of the United States and 2% were foreign born.