Square One Auto | Pre-Owned Dealership and Service Center in Rahway, NJ, Square One Auto is a pre-owned automobile dealership specializing in quality vehicles with low mileage. Hundreds of fairly priced vehicles are constantly arriving in inventory on our spacious property, We are conveniently located in Rahway, NJ in the heart of Union County and minutes from Staten Island, NYC, Middlesex, Monmouth, Essex and Somerset Counties.