Washington State

Etymology
Distinguishing the state of Washington from other senses of, particularly

Proper noun

 * 1)  or its athletic teams.
 * : synonym of Washington, the US state of Washington.

Usage notes
The capital form Washington State is appropriate as part of the name of departments, services, etc. of the government of Washington state. It is supported in general use by the Chicago Manual of Style but eschewed by most others, including the AP Style Guide.