Derby is a city in Lucas County, Iowa, United States. 90 people lived here in 2020, when the census was taken. It was founded in 1872. The city is about 0.26 square miles big.
| Year | Pop. | ±% |
|---|---|---|
| 1880 | 174 | — |
| 1910 | 326 | +87.4% |
| 1920 | 334 | +2.5% |
| 1930 | 280 | −16.2% |
| 1940 | 269 | −3.9% |
| 1950 | 194 | −27.9% |
| 1960 | 151 | −22.2% |
| 1970 | 161 | +6.6% |
| 1980 | 171 | +6.2% |
| 1990 | 135 | −21.1% |
| 2000 | 131 | −3.0% |
| 2010 | 115 | −12.2% |
| 2020 | 90 | −21.7% |
| Source:"U.S. Census website". United States Census Bureau. Retrieved 2020-03-29. and Iowa Data Center Source: U.S. Decennial Census | ||
During the 2020 census, there were 90 people, organized into 37 households. This is 21.7% less than at the 2010 census. The median age was 41.0 years.
The breakdown by age was 28.9% under 18 years, 48.9% from 18 to 65, and 22.2% over 65 years. Males make up 46.7% and females make up 53.3% of the people. The breakdown by race was 94.4% Whites (non-Latino), 4.4% Hispanics or Latinos, and 1.1% others.
Of the 37 households, 29 were family households, 20 had a married couple living together, and 14 had children under 18. The average household size is 2.43 people. Of these households, 86.5% were owner-occupied, while 13.5% were renters.
The population reached its highest point in 1920, where there were 334 people living in Derby. Today, the population is over 70% lower.