- Source: Sussex County, Western Australia
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- Sussex County, Western Australia
- Sussex County
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Sussex County was one of the 26 counties of Western Australia that were designated in 1829 as cadastral divisions. Lieutenant-Governor James Stirling named the county in honour of Prince Augustus Frederick, Duke of Sussex, the sixth son of George III.
It approximately corresponds to the modern-day Sussex Land District which forms the basis for land titles in the area.