So, you searched google maps for the location of your home/business, but the marker shows the wrong spot. Well, you can edit the marker location by following these steps.
I followed the instructions to update the location marker for Itasca Community College. Google says it may take up to 6 weeks for the change to take place. I check and post the results later.
If you have a Zip+4 zipcode, you can get a much better location pin in google maps.