addresses with zip codes mapping incorrectly

classic Classic list List threaded Threaded
1 message Options
Reply | Threaded
Open this post in threaded view
|

addresses with zip codes mapping incorrectly

John C
This post was updated on .
I've noticed that an address with a zip code often maps incorrectly.
Here's my data: mapped WITHOUT the zip code field, versus mapped WITH the zip code field.
  http://mapalist.com/Public/pm.aspx?mapid=351128  (using address, city, state)
  http://mapalist.com/Public/pm.aspx?mapid=351129  (using address, city, state, zip)

See aligned screen captures of both maps here:
  https://www.dropbox.com/sh/z2kqx4b228r1cul/SLunzUIFPZ#/
(Click a thumbnail to view a slideshow and easily spot the differences between the two maps.)

Mapping WITH zip codes, places about half the pins at the wrong locations. In one case, a group of seven all clustered at the same wrong location. (See the almost black pin shadow indicating several stacked pins.)

One would think that including the zip code would yield a more accurate result, but it's turning out just the opposite.

Do you have a better workaround, than to NOT include the zip code?