Grand Junction is a city in Greene County, Iowa, United States.

[5] According to the United States Census Bureau, the city has a total area of 0.97 square miles (2.51 km2), all land.

There were 359 housing units at an average density of 370.4 per square mile (143.0/km2).

Hispanic or Latino persons of any race comprised 1.0% of the population.

There were 383 housing units at an average density of 394.8 per square mile (152.4/km2).

33.4% of all households were made up of individuals, and 17.1% had someone living alone who was 65 years of age or older.

There were 407 housing units at an average density of 421.8 per square mile (162.9/km2).

27.1% of all households were made up of individuals, and 14.6% had someone living alone who was 65 years of age or older.

[15] The Greene County district continued operating the Grand Junction school until 2017.

In 2017 the city government decided to demolish the former Grand Junction school.