Weiser, ID has a population of 5,350 and is the 6,178th largest city in the United States. The population density is 1,794 per sq mi which is 9305% higher than the Idaho average and 1881% higher than the national average. The median age in Weiser is 39 which is approximately 8% higher than the Idaho average of 36. In Weiser, 59% of the population over 15 years of age are married, 75% speak English and 24% speak Spanish. 39% of Weiser residents were born in Idaho, 51% were born out of state, 0% were born outside of the United States and 11% were foreign born.