According to our records, this business is located at 2431 Overlook Dr. in Walnut Creek (in Contra Costa County), California 94597, the location GPS coordinates are: 37.910495 (latitude), -122.073915 (longitude). Marks Traffic Data Service is categorized under Computer Code Authors (SIC code 7371). Current estimates show that the unit has a sales volume of $785,000 and staff of approximately 5 people. You can contact the company by phone at (925) 210-0625; the following fax number is also provided: (925) 210-0625.