Winchester, ID has a population of 300 and is the 22,504th largest city in the United States. The population density is 1,756 per sq mi which is 9106% higher than the Idaho average and 1839% higher than the national average. The median age in Winchester is 53 which is approximately 49% higher than the Idaho average of 36. In Winchester, 65% of the population over 15 years of age are married, 95% speak English and 0% speak Spanish. 51% of Winchester residents were born in Idaho, 47% were born out of state, 1% were born outside of the United States and 1% were foreign born.