| O'brien Chrysler Jeep North - Indianapolis, IN | Oliverio Chevrolet Buick - Mcdonald, PA | Orrin B. Hayes - Kalamazoo, MI |
| O'brien Nissan - Hawthorne, NJ | Olsen Cadillac - Woburn, MA | Orville Beckford Ford - Milton, FL |
| O'brien Toyota Scion - Indianapolis, IN | Olympic Auto Sales - Fairfield, OH | Osage Autoworks Used Cars - Greenwich, KS |
| O'connor Chevrolet - Rochester, NY | Omni Automotive Group - Hollywood, FL | Osborn Automitive - Lakewood, CO |
| O'donnell Chevrolet-buick - San Gabriel, CA | One Stop Automotive - Knoxville, TN | Ourisman Bethesda Ford - Bethesda, MD |
| O'donnell Honda - Ellicott City, MD | Online Motors - Los Angeles, CA | Ourisman Chantilly Dodge - Chantilly, VA |
| O'hara Chrysler, Plymouth - Clinton, MI | Ontario Dodge - Ontario, CA | Ourisman Chantilly Toyota - Chantilly, VA |
| O'hara Mazda - Fairhaven, MA | Open Road Acura East Brunswick - East Brunswick, NJ | Ourisman Chevrolet - Bowie, MD |
| O'hara Mazda (new) - Fairhaven, MA | Open Road Acura Of Wayne - Wayne, NJ | Ourisman Chevrolet Mitsubishi - Marlow Heights, MD |
| O'hare Auto Group - Des Plaines, IL | Open Road Bmw Of Denville - Mountain Lakes, NJ | Ourisman Chrysler-jeep-dodge - Clarksville, MD |
| O'neal Chrysler - Scottsburg, IN | Open Road Bmw Of Edison - Edison, NJ | Ourisman Dodge & Imports - Alexandria, VA |
| O'reilly Pontiac-buick-gmc - Newtown Square, PA | Open Road Honda - Edison, NJ | Ourisman Fairfax Toyota - Fairfax, VA |
| O'shea Truck Center - Trenton, NJ | Open Road Mazda - East Brunswick, NJ | Ourisman Honda - Bethesda, MD |
| Oak Ridge Nissan -new - Oak Ridge, TN | Open Road Nissan - Morristown, NJ | Ourisman Honda-vw Of Laurel - Laurel, MD |
| Obrien Motors, Inc. New - Walla Walla, WA | Opequon Motors Buick Cadi. Gmc - Martinsburg, WV | Ourisman World Of Ford - Alexandria, VA |
| Obrien Motors, Inc. Used - Walla Walla, WA | Orangeburg Chrysler Dodge - Orangeburg, SC | Ourisman's Rockmont Chevrolet - Rockville, MD |
| Ocala Nissan/mitsubishi - Ocala, FL | Orangeburg Nissan - Orangeburg, SC | Ourisman's Wheaton Chevrolet - Wheaton, MD |
| Ocean Mazda - Miami, FL | Orchard Chrysler Dodge Jeep - Washington Twp., MI | Outlet Rental Car Sales - Dothan, AL |
| Ocean Subaru - North Hampton, NH | Orielly Chevrolet - Tucson, AZ | Overall Ford (new) - Jones, OK |
| Oconnor Chevrolet - Alsip, IL | Orland Park Nissan - Orland Park, IL | Overall Ford (used) - Jones, OK |
| Ogden Lincoln Mercury Aurora - North Aurora, IL | Orland Toyota - Tinley Park, IL | Overturf Volkswagen Audi & Kia - Kennewick, WA |
| Ok Used Cars - Sauk Rapids, MN | Orlando Dodge Chrysler Jeep - Orlando., FL | Owasso Auto Outlet - Owasso, OK |
| Olathe Kia - Olathe, KS | Ormond Fine Imports - Ormond Beach, FL | Owl Chrysler Jeep - Honesdale, PA |
| Olathe Subaru - Olathe, KS | Orr Auto Ranch - Atlanta, TX | Oxford Motors - Oxford, PA |
| Old Mill Toyota - Omaha, NE | Orr Cadillac - Springfield,, MA | Oxmoor Ford - Louisville, KY |
| Ole Ben Franklin Motors - Knoxville, TN | Orr Chevrolet - Texarkana, TX | Oxmoor Hyundai - Louisville, KY |
| Oliver Ford Lincoln Mercury - Plymouth, IN | Orr Nissan - Bossier City, LA | Oxmoor Toyota - Louisville, KY |