信安郡中國隋朝時設置的

大業三年(607年)改端州置,治所高要縣(今廣東省肇慶市)。轄境相當今廣東省肇慶、德慶雲浮新興等市地及陽春市北部。大業九年(613年),農民起義軍陳瑱曾攻占此地。唐朝武德四年(621年)仍為端州。

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