I'm not sure of that at all. I'll bet multiple agencies have multiple definitions.
I was talking singular agencies, and I agree that there are probably many agencies with their own definition.
From Wikipedia (for what it’s worth)...
The 1970 Census was the first time that a “Hispanic” identifier was used and data collected with the question. The definition of “Hispanic” has been modified in each successive census. The 2000 Census asked if the person was “Spanish/Hispanic/Latino”.[13]
The U.S. Office of Management and Budget currently defines “Hispanic or Latino” as “a person of Mexican, Puerto Rican, Cuban, South or Central American, or other Spanish culture or origin, regardless of race”.[14] This definition excludes people of Portuguese origins, such as Portuguese Americans or Brazilian Americans. However, they are included in some government agencies’ definitions. For example, the U.S. Department of Transportation defines Hispanic to include, “persons of Mexican, Puerto Rican, Cuban, Dominican, Central or South American, or others Spanish or Portuguese culture or origin, regardless of race.”[15] This definition has been adopted by the Small Business Administration as well as many federal, state, and municipal agencies for the purposes of awarding government contracts to minority owned businesses. Still, other government agencies adopt definitions that exclude people from Spain, since there is a distinct ethnic difference (indigenous American or European American). Some others include people from Brazil, but not Spain or Portugal.
The U.S. Equal Employment Opportunity Commission encourages any individual who believes that he or she is Hispanic according to the U.S. Office of Management and Budget definition (any Spanish culture or origin) to self-identify as Hispanic.[16] The United States Department of Labor - Office of Federal Contract Compliance Programs encourages the same self-identification.[17] As a result, any individual who traces his or her origins to part of the Spanish Empire may self-identify as Hispanic, because an employer may not override an individual’s self-identifcation.[18]
http://en.wikipedia.org/wiki/Hispanic
So it looks like anyone can claim to be Hispanic.