Until the fall of 2005 when some of its municipal land was abandoned as part of Israel's unilateral disengagement plan, the Shomron Regional Council had been the largest Israeli regional council in municipal area.
Sampai musim gugur tahun 2005 ketika beberapa tanah ditinggalkan sebagai bagian rencana penarikan diri sepihak Israel, Dewan Regional Shomron adalah dewan regional terbesar di Israel.