Imperial County is a place in California.
Imperial County may also refer to:
- Imperial county, a fief held by an imperial count of the Holy Roman Empire
- Imperial County of Bretzenheim, a minor principality in pre-Napoleonic Germany
- Imperial County of Ortenburg, a state of the Holy Roman Empire
- Imperial County of Rantzau, a state of the Holy Roman Empire
- Imperial County of Reuss, several historical states in present-day Thuringia, Germany
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