The county includes the islands of Hiiumaa (980 km²) and Kassari (19 km²) and a number of surrounding islets.
Kalana, Hiiu County, village in Kõrgessaare Parish, Hiiu County, Estonia
Risti, Hiiu County, village in Kõrgessaare Parish, Hiiu County, Estonia
Rootsi, Hiiu County, village in Kõrgessaare Parish, Hiiu County, Estonia
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Sigala, village in Kõrgessaare Parish, Hiiu County, Estonia
Tammela, Estonia, a village in Pühalepa Parish, Hiiu County, Estonia