Potosi, TX has a population of 3,074 and is the 8,688th largest city in the United States. The population density is 168 per sq mi which is 73% higher than the Texas average and 85% higher than the national average. The median age in Potosi is 35 which is approximately 2% higher than the Texas average of 34. In Potosi, 73% of the population over 15 years of age are married, 91% speak English and 9% speak Spanish. 61% of Potosi residents were born in Texas, 33% were born out of state, 3% were born outside of the United States and 2% were foreign born.