The YPG said in a statement its headquarters in Mount Karachok near Malikiya had been hit, including a media centre, a local radio station, communications facilities and military institutions.
Turkey's warplanes have regularly bombed the mountainous border area between Iraq and Turkey where PKK militants are based since a ceasefire broke down in July 2015, but it is the first time it has targeted its affiliate in the Sinjar region.
On Sunday, Turkey's air force commander said the military had "plans" for PKK rebels around Sinjar, vowing not to allow the area to become a new hub for the militant group, Hurriyet newspaper reported.
Yawar and other officials said the overnight strike apparently targeted a Yazidi militia allied with Turkey's Kurdistan Workers' Party (PKK) which Ankara, a key ally of the Iraqi Kurdish government, considers a terrorist organisation.
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Founded in 1978, the PKK has waged a decades long bloody campaign against Turkey.
The YPG, a U.S. ally in the fight against Islamic State, did not immediately give its own precise death toll. The Kurdish group, which has led an insurgency in southeast Turkey since 1984, is considered a terror organization by Turkey and its allies.
The PKK, which is listed as a terrorist organization by Turkey, the US, and the European Union, resumed its armed campaign in July 2015 after a brief reconciliation period. Since then, the IS has suffered major setbacks at the hands of the coalition, losing large chunks of the territory the Sunni militant group once held.