I'm afraid that for some cities, like Marietta, we don't have neighborhood information, however we do allow you to filter your results by zip codes. I'm also afraid that neighborhoods can't be added to our site.
Please keep in mind however, that, when you use the 'search within map' option, you pinpoint the specific location you want to focus on just by moving the map. I hope that information is helpful.
Please let us know if you have any additional questions or suggestions for us.