Firth, ID has a population of 437 and is the 20,379th largest city in the United States. The population density is 762 per sq mi which is 3896% higher than the Idaho average and 742% higher than the national average. The median age in Firth is 37 which is approximately 4% higher than the Idaho average of 36. In Firth, 75% of the population over 15 years of age are married, 85% speak English and 15% speak Spanish. 68% of Firth residents were born in Idaho, 24% were born out of state, 3% were born outside of the United States and 4% were foreign born.
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The population density in Firth is 3896% higher than Idaho.
The median age in Firth is 4% higher than Idaho.
In Firth 85.35% of the population is White.
In Firth 0.00% of the population is Black or African American.