Abstract: The invention provides a modular fence system that includes a picket and a rail having upper and lower rail elements engagable together generally without fasteners. The lower rail member includes an opening having a tab extending therein. The opening is sized to allow the picket to be inserted therethrough allowing clearance for the tab. Upon assembly, the picket and the lower rail member move laterally relative to each other, allowing the tab to enter an opening formed in the picket side, thus holding the picket vertically. The upper rail member can be disposed over the picket through an opening in the upper rail member, so that engagement elements on the upper and lower rail members engage. The upper rail member opening is sized smaller than the lower rail member opening and holds the picket laterally in position, keeping the picket engaged with the tab inserted therein.