| Hospitals | 204 |
| Hotels | 207 |
| House & Building Movers | 211 |
| House Cleaning | 211 |
| House Cleaning Equipment & Supplies | 212 |
| House Washing-Exterior | 212 |
| Housing Authorities | 212 |
| Hunting & Fishing Licenses | 212 |
| Hydraulic Equipment Repairing | 212 |
| Hydroseeding | 212 |
| Hypnotherapists | 212 |
| I |
| Ice | 212 |
| Ice Cream & Frozen Desserts-Dealers | 212 |
| Ice Making Equipment & Machines | 212 |
| Ice Making Equipment & Machines-Repairing & | 214 |
| Service |
| Ice-Whsle | 214 |
| Image Consultants | 214 |
| Imaging Services | 214 |
| Immigration & Naturalization Consultants | 214 |
| Importing-General | 214 |
| Industrial Consultants | 214 |
| Industrial Equipment & Supplies | 214 |
| Insecticides | 214 |
| Insulation Contractors-Cold & Heat | 214 |
| Insulation Materials-Cold & Heat | 214 |
| Insurance | 215 |
| Insurance-Annuities | 219 |
| Insurance-Automobile & Vehicle | 219 |
| Insurance Brokers | 220 |
| Insurance Consultants | 220 |
| Insurance-Bond | 220 |
| Insurance-Burial | 220 |
| Insurance-Business & Commercial | 220 |
| Insurance-Flood | 220 |
| Insurance-General | 220 |
| Insurance-Group | 220 |
| Insurance-Health & Accident | 220 |
| Insurance-Homeowners | 221 |
| Insurance-Life | 221 |
| Insurance-Marine | 221 |
| Insurance-Medicare Supplements | 221 |
| Insurance-Mobile Homes | 221 |
| Insurance-Motorcycle | 221 |
| Insurance-Property & Casualty | 221 |
| Intercom Systems & Services | 221 |
| Interior Decorators | 221 |
| Interior Designers | 222 |
| Internet-Advertising | 222 |
| Internet Products & Services | 223 |
| Internet-Marketing Services | 223 |
| Internet-Service Providers | 223 |
| Investigators | 223 |
| Investment Securities | 223 |
| Investments-Real Estate | 223 |
| Invitations & Announcements | 223 |
| Iron | 223 |
| Ironwork | 223 |