How can I find a mesh's position when affected by a constraint? So basically, I have a mesh that is moving via a constraint. However, because it is a constraint movement, I can't find the position of the mesh. So, is there any way I can find the current position of a mesh, even when affected by a constraint? (I mean like in numerical form)
Presuming you can see the model in object mode, Select it and press SH-S, choose "Cursor to selected".  The 3D cursor will jump to the model's origin point.  Press N and you can read off the 3D cursor's location.

If you want to store this within the Blender file, ADD an Empty.  It will appear at that location and it's own location readings at right will be the same as the 3D cursor's.

You haven't stated what constraint(s) you're inquiring about so I've just tested this out both with a path constraint and parenting the object object to another.  Both work as described.