Please understand that the maps for house locations come from outside sources, such as google, yahoo, etc. The agent doesn't have any control over which side of the road the house shows up on line.
If you want more details use a GPS and it does a pretty good job. Also, if you are familiar with the area, streets are usually divided with even numbers on one side and odd on the other. You could probably figure it out by using that system.
Have an amazing day!