Explore details about location Ridge Crest. Ridge Crest is a location situated within the DeKalb County alongside other areas such as Blackshear Drive, Old Highgate Entry, North Kilgo Circle. Additionally, some smaller parts of Ridge Crest include specific areas like Northeast Expressway Northeast, Saint Clair Drive Northeast, I- 85 Access Rd NE; Northeast Expy Northeast adding to the diversity of its landscape.