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From the 3D view-port open the object properties (N),
  scroll down and expand 3D Cursor, the Z: axis value can be entered from here and your objects will be added to the new location.
  When typing values switch between X: Y: and Z: with (Tab) and (Shift+Tab), or just scrub with mouse over them.

From the 3D Viewport, open the object properties with N, scroll down and expand 3D Cursor. You can enter the Z-axis value here, and your objects will be added to the new location. When typing values, switch between X, Y, and Z with Tab and Shift+Tab, or just scrub with the mouse over them.