There is a city named Sunderland in several places across the world. Since you want to know the county, we can assume you are referring to a Sunderland in the US, since the US has states divided by counties. Therefore, it would help for a questioner to include in the state and/or country in the question when asking on WikiAnswers.
There is a Sunderland in Massachusetts in FranklinCounty.
There is also a Sunderland in Maryland in CalvertCounty.
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