Agency is a village in Buchanan County, Missouri, United States.

[7] On Sunday, May 20, 1923, a Ku Klux Klan picnic held at Agency was attended by several thousand people.

[10] As of the census[12] of 2010, there were 684 people, 257 households, and 210 families living in the village.

There were 268 housing units at an average density of 63.1 per square mile (24.4/km2).

12.5% of all households were made up of individuals, and 5.1% had someone living alone who was 65 years of age or older.

As of the census[4] of 2000, there were 599 people, 214 households, and 176 families living in the village.

There were 222 housing units at an average density of 114.6 per square mile (44.2/km2).

12.6% of all households were made up of individuals, and 2.8% had someone living alone who was 65 years of age or older.