Walsh, CO has a population of 607 and is the 18,370th largest city in the United States. The population density is 1,358 per sq mi which is 2627% higher than the Colorado average and 1399% higher than the national average. The median age in Walsh is 52 which is approximately 44% higher than the Colorado average of 36. In Walsh, 70% of the population over 15 years of age are married, 79% speak English and 18% speak Spanish. 43% of Walsh residents were born in Colorado, 44% were born out of state, 0% were born outside of the United States and 13% were foreign born.