Walsenburg, CO has a population of 2,917 and is the 8,946th largest city in the United States. The population density is 976 per sq mi which is 1860% higher than the Colorado average and 977% higher than the national average. The median age in Walsenburg is 47 which is approximately 29% higher than the Colorado average of 36. In Walsenburg, 47% of the population over 15 years of age are married, 89% speak English and 11% speak Spanish. 71% of Walsenburg residents were born in Colorado, 27% were born out of state, 1% were born outside of the United States and 1% were foreign born.