Weiser, ID has a population of 5,407 and is the 6,118th largest city in the United States. The population density is 1,601 per sq mi which is 8327% higher than the Idaho average and 1667% higher than the national average. The median age in Weiser is 38 which is approximately 9% higher than the Idaho average of 35. In Weiser, 59% of the population over 15 years of age are married, 76% speak English and 23% speak Spanish. 33% of Weiser residents were born in Idaho, 56% were born out of state, 0% were born outside of the United States and 12% were foreign born.