Wilder, ID has a population of 1,405 and is the 13,079th largest city in the United States. The population density is 1,988 per sq mi which is 10321% higher than the Idaho average and 2095% higher than the national average. The median age in Wilder is 25 which is approximately 30% lower than the Idaho average of 36. In Wilder, 53% of the population over 15 years of age are married, 36% speak English and 63% speak Spanish. 55% of Wilder residents were born in Idaho, 17% were born out of state, 1% were born outside of the United States and 27% were foreign born.