Here is an interesting experiment on geolocation I did using Google maps and Google Analytics:I made a list of all the postcodes of people who had bought a sign in June. I plotted these onto a map. Here they are:
I then retrieved a map of my conversions for June using Google Analytics. Here it is:
As you can see, Google is doing a pretty good job of catching most people’s locations. You can check to see how accurate your geolocation is by clicking here.