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遼太祖以定州望都縣俘戶置，因仍名望都縣，屬南京道平州[1]。金大定七年（1167年），改為海山縣[2]，治所在今河北省盧龍縣南，仍屬平州。元至元二年（1265年），省入昌黎縣。三年復置，次年又省[3]。
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