Vastus is an unincorporated community in southern Butler County, in the U.S. state of Missouri.

[2] A post office called Vastus was established in 1891 and remained in operation until 1927.

[3] Vastus is a name derived from Latin, signifying "great".

[4] The climate in this area is characterized by hot, humid summers and generally mild to cool winters.

This Butler County, Missouri state location article is a stub.