Grain Valley is a city in Jackson County, Missouri, United States.

[6] A post office called Grain Valley has been in operation since 1879.

[7] Grain Valley was founded primarily by former residents and business owners of Pink Hill, Missouri who moved to this area after the Chicago and Alton Railroad built a railway through this area in 1878, bypassing the former community of Pink Hill, Missouri.

The townspeople needed to take advantage of the commerce that the railroad would provide during this era.

[9] The 2020 United States census[11] counted 15,627 people, 5,109 households, and 3,656 families in Grain Valley.

There were 5,254 housing units at an average density of 852.9 per square mile (329.2/km2).

Of all households, 23.7% consisted of individuals and 9.4% had someone living alone who was 65 years of age or older.

In the 2010 census there were 12,854 people in 4,566 households, including 3,395 families, in the city.

There were 4,867 housing units at an average density of 803.1 per square mile (310.1/km2).

There were 2,022 housing units at an average density of 421.2 per square mile (162.6/km2).

The Owner–Operator Independent Drivers Association is based in Grain Valley.

The Grain Valley R-V School District serves Grain Valley, as well as parts of Blue Springs, Oak Grove, and unincorporated eastern Jackson County, in the State of Missouri.