| Name | Phone | Category |
| Oak Hills Veterinary Clinic & Bird Hospital / Salem Cat Clinic | 503-581-8161 | Veterinarians |
| Oak Park Family Dental Care, LLC | 503-588-0047 | Dentists |
| Oak Park Family Dental Care, LLC | 503-588-0047 | Dentists |
| O-Babie Gourmet Bakery | 503-463-1534 | Bakery |
| O'Brien Auto Group | 503-581-1421 | Auto Dealers - New Cars |
| Office Depot | 503-370-7700 | Office Supplies |
| Office Depot #2682 | 503-390-4784 | Office Supplies |
| Office Depot #987 | 503-378-7880 | Office Supplies |
| Office Max | 503-375-0246 | Office Supplies |
| Office of Private Health Partnerships | 503-373-1692 | Government Agencies |
| Office of Vocational Rehabilitation Services - Hawthorne Branch Office | 503-378-3587 | Employment Agencies |
| Office of Vocational Rehabilitation Services - Marion/Polk Branch | 503-378-5334 | Government Agencies |
| The Olive Garden | 503-364-6885 | Restaurants |
| Olivia's | 503-581-6953 | Gifts - Retail |
| Olsen Homes & Renovation | 503-393-5067 | Home Improvement & Remodeling |
| Olson Florist | 503-363-7166 | Florist - Retail |
| O'Neill Pine Company/FPS | 503-315-2400 | Timber & Timberland Companies |
| Onsite PC Help | 503-931-2536 | Computers - Service & Repair |
| Opt-E-Web LLC | 503-588-8778 | Consultants - Technology |
| Optimist Club of Salem | 503-585-6843 | Associations |
| Orchard Heights Assisted Living Community | 503-566-9052 | Assisted Living |
| Orchard View Veterinary Center | 503-585-1616 | Veterinarians |
| Oregon Ag Fest | 503-535-9353 | Events & Festivals |
| Oregon Anti-Crime Alliance | 503-364-3909 | Associations |
| Oregon Business Leadership Network | 503-281-1424 | Associations |
| Oregon Capital Chapter Public Relations Society of America | 503-585-8254 | Associations |
| Oregon Cascade Plumbing & Heating, Inc. | 503-588-0355 | Plumbing Contractors |
| Oregon Cherry Growers, Inc. | 503-364-8421 | Food Products |
| Oregon Coachways | 503-581-6100 | Bus Lines |
| Oregon Community Credit Union | 503-588-2347 | Credit Unions |
| The Oregon Community Foundation, North Willamette Valley Office | 503-779-1927 | Associations |
| Oregon Department of Public Safety Standards | 503-378-2100 | Government Agencies |
| Oregon Employees Federal Credit Union | 503-588-0211 | Credit Unions |
| Oregon Employment Department | (503) 378-4846 | Employment Agencies |
| Oregon Farm Bureau Federation | 503-399-1701 | Associations |
| The Oregon Garden | 503-874-8100 | Entertainment & Amusement Places |
| Oregon Garden Resort | 503-874-2500 | Hotels & Other Accommodations |
| Oregon Housing & Associated Services Inc | 503-585-6193 | Social Service Organizations |
| Oregon Human Development Corporation | 503-982-5100 | Employment Training |
| Oregon Industrial Repair | 503-399-1926 | Machine Shops |
| Oregon Lock & Access, Inc | 503-375-3173 | Locks & Locksmiths |
| Oregon Military Department | (503) 584-3530 | Government Agencies |
| Oregon Northwest Black Pioneers | 503-540-4063 | Educational Speaker |
| Oregon Paralyzed Veterans of America | 503-362-7998 | Disabled Persons Assistance |
| Oregon Restaurant Association | 503-730-7255 | Associations |
| Oregon School of Massage | 503-585-8912 | Schools |
| Oregon State Fair & Exposition Center | 503-947-3247 | Banquet Facilities |
| Oregon Symphony Association in Salem | 503-364-0149 | Arts & Culture |
| Oregon Wedding Showcase | (503) 838-2226 | Trade Shows, Expositions & Fairs |
| Original Roadhouse Grill | 503-375-0942 | Restaurants |
| Orkin Pest Control | 1-800-562-5610 | Pest Control Services |
| OSU Extension Service | 503-588-5301 | Education - Consultants & Services |
| OSU Federal, Your Community Credit Union | 503-585-9100 | Credit Unions |
| Outback Steakhouse Salem | 503-399-3700 | Restaurants |
| Outdoor Fence Company | 503-399-1934 | Fence |
| Overhead Door Company of Salem | 503-393-1236 | Garage Doors & Openers |
| Oxi Fresh Northwest | 561-827-5434 | Carpet & Rug Cleaners |