| Ice Cream & Frozen Desserts-Dealers | 243 |
| Ice Cream & Frozen Desserts-Mfrs & Distributors | 243 |
| Ice Cream Cone Mfrs & Distributors | 243 |
| Ice Cream Freezers-Sales, Service & Parts | 243 |
| Ice Cream Parlors | 243 |
| Ice Making Equipment & Machines | 243 |
| Ice Making Equipment & Machines-Renting | 243 |
| Ice Making Equipment & Machines-Repairing & | 243 |
| Service |
| Ice-Whsle | 243 |
| Identification Card Service | 243 |
| Identification Equipment & Supplies | 244 |
| Image Consultants | 244 |
| Imaging Services | 244 |
| Immigration & Naturalization Consultants | 244 |
| Importers | 244 |
| Importers-Clothing | 244 |
| Importing-General | 244 |
| Industrial Equipment & Supplies | 244 |
| Industrial Hygiene Consultants | 244 |
| Infrared Equipment | 244 |
| Inns | 244 |
| Insect Control Devices | 244 |
| Inspection Bureaus | 244 |
| Insulation Contractors Equipment & Supplies | 245 |
| Insulation Contractors-Cold & Heat | 245 |
| Insulation Materials-Cold & Heat | 245 |
| Insulation Materials-Cold & Heat-Whsle | 245 |
| Insurance | 245 |
| Insurance-Annuities | 250 |
| Insurance Brokers | 251 |
| Insurance Claim Processing Services | 251 |
| Insurance Consultants | 251 |
| Insurance-Automobile & Vehicle | 251 |
| Insurance-Burial | 251 |
| Insurance-Business & Commercial | 251 |
| Insurance-Dental | 251 |
| Insurance-Disability | 251 |
| Insurance-Excess & Surplus | 251 |
| Insurance-Flood | 251 |
| Insurance Schools | 252 |
| Insurance-General | 252 |
| Insurance-Group | 252 |
| Insurance-Health & Accident | 252 |
| Insurance-Homeowners | 252 |
| Insurance-Life | 252 |
| Insurance-Marine | 252 |
| Insurance-Medicare Supplements | 252 |
| Insurance-Property & Casualty | 252 |
| Insurance-Risk Management | 252 |
| Insurance-Title | 252 |
| Insurance Underwriters | 253 |
| Insurance-Trucks-Commercial | 253 |
| Insurance-Worker’s Compensation | 253 |
| Intercom Systems & Services | 253 |
| Interior Decorators | 253 |
| Interior Decorators’ & Designers’ Supplies | 253 |
| Interior Decorators’ & Designers’ Supplies-Whsle & | 253 |
| Mfrs |
| Interior Designers | 253 |
| International Trade | 254 |
| International Trade Consultants | 254 |
| Internet-Advertising | 254 |