Declo is a city located in Cassia County Idaho. With a 2020 population of 373, it is the 145th largest city in Idaho and the 14525th largest city in the United States . Declo is currently growing at a rate of 0.54% annually and its population has increased by 8.75% since the most recent census, which recorded a population of 343 in 2010. Declo reached it's highest population of 373 in 2021. Spanning over 0 miles, Declo has a population density of 1,348 people per square mile.
The average household income in Declo is $54,278 with a poverty rate of 16.57%. The median rental costs in recent years comes to $605 per month, and the median house value is $80,000. The median age in Declo is 33.1 years, 27.2 years for males, and 36.3 years for females.