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This paper proposes a distributed mobility scheme using the hash function in the Proxy Mobile IPv6 (PMIP) networks. In the existing PMIP Localized Routing (PMIP-LR), all the control and data traffics are concentrated at the Local Mobility Anchor (LMA). This centralized scheme tends to increase the network operation costs due to overwhelming traffic overhead at LMA. In this paper, we propose a Hash-based Distributed PMIP (PMIP-HD) scheme, in which the control functions for binding update and query operations are performed based on a hash function and thus the traffic overhead is distributed onto Mobile Access Gateway (MAG). From the numerical analysis, it is shown that the proposed scheme can reduce the costs associated with signaling control and data delivery, compared to the existing PMIP, PMIP-LR and other distributed PMIP schemes.