Alden is a city in Hardin County, Iowa, United States.

There were 356 housing units at an average density of 231.0 per square mile (89.2/km2).

Hispanic or Latino persons of any race comprised 6.0% of the population.

There were 368 housing units at an average density of 215.2 per square mile (83.1/km2).

31.1% of all households were made up of individuals, and 16.5% had someone living alone who was 65 years of age or older.

There were 372 housing units at an average density of 216.5 per square mile (83.6/km2).

25.1% of all households were made up of individuals, and 14.8% had someone living alone who was 65 years of age or older.

[12] Alden is believed to have the smallest endowed Carnegie Library built in the United States.

[14] The original Library was built in 1914 with the grant from the Carnegie Foundation.

In 1998 a Capital Campaign was started to raise $550,000 for an addition that would double the size of the library.