| Name | Phone | Category |
| I-35 Spirits | (515) 963-1877 | Retail-Shops-Stores |
| Identity Solutions | (515) 963-8170 | Advertising |
| IEA Wealth Management, LLC | (515) 965-8585 | Finance |
| IHOP | (515) 963-0102 | Restaurants |
| Imaging Technologies | (515) 256-4000 | Business Products |
| Imperial RV Center | (515) 964-1424 | Automotive |
| Infomax Office Systems, Inc. | (515) 244-5203 | Business Products |
| Integrity Mortgage Group | (515) 965-0445 | Finance |
| Internet Consulting Services, LLC | (515) 232-4453 | Computer |
| Internet Solver | (515) 224-9229 | Communications |
| Iowa - Des Moines Supply, Inc. | (515) 263-1200 | Distributors |
| Iowa Beverage System, Inc. | (515) 266-2274 | Distributors |
| Iowa Board of Certification | (515) 965-5509 | Organizations |
| Iowa Chiropractic Clinic, P.C. | (515) 964-3000 | Health Care |
| Iowa Clinic - Kathleen R Gannon, D.O. | (515) 964-7115 | Health Care |
| Iowa Concrete Paving Association | (515) 963-0606 | Organizations |
| Iowa Egg Council | (515) 727-4701 | Organizations |
| Iowa FFA Foundation | (515) 967-4000 | Organizations |
| Iowa Financial Partners | (515) 289-0222 | Finance |
| Iowa Health Express Care - Ankeny | (515) 964-1601 | Health Care |
| Iowa Helicopter | (515) 240-8138 | Photography |
| Iowa Leadership Academy | (515) 964-7075 | Business Services |
| Iowa Methodist Occupational Health & Wellness | (515) 262-7619 | Health Care |
| Iowa Radiology | (515) 226-9810 | Health Care |
| Iowa Realty | (515) 453-6381 | Real Estate |
| Iowa Realty - Janae Griffith | (515) 321-0712 | Real Estate |
| Iowa Realty - John Knox | (515) 720-8185 | Real Estate |
| Iowa Realty - John Lundstrum | (515) 964-2078 | Real Estate |
| Iowa Realty - Karen Kelly | (515) 453-5167 | Real Estate |
| Iowa Realty - Lisa McDaniel | (515) 453-6367 | Real Estate |
| Iowa Realty - Sara Houlihan | (515) 447-2943 | Real Estate |
| Iowa Realty - Teresa Knox | (515) 240-3078 | Real Estate |
| Iowa Sleep Disorders Center | (515) 225-0188 | Health Care |
| Iowa Sleep Disorders Center - Khaleel Ahmed, M.D. | (515) 225-0188 | Health Care |
| Iowa Soybean Association | (515) 251-8640 | Organizations |
| Iowa State University Alumni Association | (515) 294-6525 | Organizations |
| Iowa Telecom | (877) 786-4692 | Communications |
| Iron Mountain | (515) 331-3516 | Data |
| ISB/College of Natural Health | (515) 965-3991 | Education |