The distance between the area of the zip code you entered and an
organization is calculated from the center of your zipcode's area
to the center of the zip in which the organization is located.
Note that the distance uses the straight line direction between
the two points, i.e. actual roads distances and obstacles that
might exist are not accounted for.
Therefore, the distance displayed might not be the actual
distance between your zipcode and the place you want to visit.
However, in most cases this distance will give a good estimation
of the distance to each place, especially when comparing one place
to another. Note that places in the same zipcode will have the
same distance (from the zipcode's area you entered) even if they
are not located in the same location.