Spencer is a city located in Idaho. With a 2020 population of 32, it is the 196th largest city in Idaho and the 19288th largest city in the United States. Spencer is currently declining at a rate of 0.00% annually and its population has decreased by -13.51% since the most recent census, which recorded a population of 37 in 2010. Spencer reached it's highest population of 37 in 2010. Spanning over 1 miles, Spencer has a population density of 28 people per square mile.
The average household income in Spencer is $32,529 with a poverty rate of 0.00%. The median rental costs in recent years comes to - per month, and the median house value is $175,000. The median age in Spencer is 65.8 years, 68 years for males, and 62.8 years for females. For every 100 females there are 100.0 males.