Web developers want to link the address with Google or Yahoo map automatically. It is very easy.

For example, whitehouse address: 1600 Pennsylvania Avenue NW Washington, DC 20500

<a href="http://maps.google.com/?q=loc:1600 Pennsylvania Avenue NW Washington, DC 20500" target="new">Google Map</a>

<a href="maps.yahoo.com/maps_result?addr=1600 Pennsylvania Avenue NW&csz=Washington, DC 20500" target="new">Yahoo Map</a>

If you retrive the address from the database, here is the sample code. You can see the live demo www.Myhouseinfo.com
<a href="http://maps.google.com/?q=loc:+<?=$add_array[sample_address]?>+<?=$add_array[sample_city]?>+<?=$add_array[sample_state]?>
+<?=$add_array[sample_zip]?>" target="new">Google Map</a>

&nbsp;&nbsp;&nbsp;<a href="http://maps.yahoo.com/maps_result?addr=<?=$add_array[sample_address]?>&csz=<?=$add_array[sample_city]?>
+<?=$add_array[sample_state]?>+<?=$add_array[sample_zip]?>&country=us" target="new">Yahoo Map</a>