| Name | Phone | Category |
| NAIFA-Frederick | 443-982-2660 | Career Services |
| Nassau Broadcasting Partners, L.P. | (301) 620-7700 | Radio/Television |
| Natelli Communities | (301) 670-4020 | Developers |
| National Academy of Professional Development | (301) 695-0530 | Career Services |
| National Cancer Institute at Frederick | 301-846-1108 | Government Agencies |
| National Kidney Foundation of Maryland, Inc. | (410) 533-3075 | Non-Profit Organizations |
| National Museum of Civil War Medicine | (301) 695-1864 | Museum |
| Natural Fusion Hair Studio | (301) 662-1766 | Beauty Salons/Shops/Spas |
| NaturaLawn of America, Inc. | (301) 694-5440 | Lawn/Garden/Landscaping Care |
| NBC 25 | (301) 698-5225 | Radio/Television |
| New Era Custom Design and Cabinet Works Inc. | (301) 695-4310 | Cabinet Makers |
| New Market Mini Storage | (301) 865-9545 | Storage - Household/Commercial |
| Newbridge Spine & Pain Center | 301-668-9988 | Physicians / Surgeons |
| NewTek Energy Solutions | 301-514-1655 | Energy Services |
| NewTeQ Computer Services, Inc. | (301) 473-4363 | Computers/Internet |
| Noahs' Frederick Management Corp. (FMC) | (301) 663-4442 | Property Management |
| Northwestern Mutual Financial Network | (301) 662-4877 | Insurance Agencies/ Brokers |