Spencer, ID has a population of 31 and is the 28,588th largest city in the United States. The population density is 27 per sq mi which is 42% higher than the Idaho average and 70% lower than the national average. The median age in Spencer is 66 which is approximately 84% higher than the Idaho average of 36. In Spencer, 87% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 39% of Spencer residents were born in Idaho, 61% were born out of state, 0% were born outside of the United States and 0% were foreign born.
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The population density in Spencer is 42% higher than Idaho.
The median age in Spencer is 84% higher than Idaho.
In Spencer 100.00% of the population is White.
In Spencer 0.00% of the population is Black or African American.