Centennial, WY has a population of 176 and is the 24,999th largest city in the United States. The population density is 11 per sq mi which is 83% higher than the Wyoming average and 88% lower than the national average. The median age in Centennial is 51 which is approximately 38% higher than the Wyoming average of 37. In Centennial, 66% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 52% of Centennial residents were born in Wyoming, 48% were born out of state, 0% were born outside of the United States and 0% were foreign born.