| Field Crop Farm in Firth, ID (6) | Churches in Firth, ID (5) |
| Schools in Firth, ID (4) | Auctioneers in Firth, ID (3) |
| House Construction Contractors in Firth, ID (3) | Religious Organization in Firth, ID (3) |
| Cattle Ranching in Firth, ID (2) | Dairy Equipment & Supplies (Wholesale) in Firth, ID (2) |
| General Crop Farm in Firth, ID (2) | Sweet Potato Farm in Firth, ID (2) |
| Acoustical Materials in Firth, ID (1) | Advertising - Direct Mail in Firth, ID (1) |
| Airport Airport Services Mfg Aircraft Parts Equipment R in Firth, ID (1) | Antiques - Dealers in Firth, ID (1) |
| Attorneys & Lawyers in Firth, ID (1) | Auto Body Repair Painting in Firth, ID (1) |
| Auto Parts & Machine Shop in Firth, ID (1) | Automobile Dealers - Used Cars in Firth, ID (1) |
| Automobile Parts & Supplies - Retail - New in Firth, ID (1) | Automobile Repairing & Service in Firth, ID (1) |
| Bars in Firth, ID (1) | Beauty Salons in Firth, ID (1) |
| Boutique Items - Retail in Firth, ID (1) | Business Construction Services in Firth, ID (1) |
| Cash Grains Farm in Firth, ID (1) | City Government - Executive Offices in Firth, ID (1) |
| Clinics in Firth, ID (1) | Concrete Contractors in Firth, ID (1) |
| Convenience Stores in Firth, ID (1) | Credit Unions in Firth, ID (1) |
| Delivery Service in Firth, ID (1) | Dried Dehydrated Fruits Vegetables (Mfr) in Firth, ID (1) |
| Drugs Sundries in Firth, ID (1) | Dry Wall Contractors in Firth, ID (1) |
| Exporters in Firth, ID (1) | Farms in Firth, ID (1) |
| Feed - Dealers (Wholesale) in Firth, ID (1) | Floor Laying Contractor in Firth, ID (1) |
| Gasoline Station Construction Service in Firth, ID (1) | Glass - Auto Plate & Window & Etc in Firth, ID (1) |
| Grocery - Retail in Firth, ID (1) | Heating Contractors in Firth, ID (1) |
| Home Contractor in Firth, ID (1) | Hot Tubs & Spas - Service & Repair in Firth, ID (1) |
| Interior Decorators Design & Consultants in Firth, ID (1) | Labor Organizations in Firth, ID (1) |
| Legal Services in Firth, ID (1) | Marble - Cultured (Wholesale) in Firth, ID (1) |
| Mfg Cut Stone Products in Firth, ID (1) | Optometrists Od in Firth, ID (1) |
| Painters in Firth, ID (1) | Painting Contractor in Firth, ID (1) |
| Post Offices in Firth, ID (1) | Pumps (Wholesale) in Firth, ID (1) |
| Real Estate in Firth, ID (1) | Real Property Lessor Vegetable Melon Farm in Firth, ID (1) |
| Retail Fruits Vegetables in Firth, ID (1) | Retreat Houses in Firth, ID (1) |
| Roofing Contractors & Roofers in Firth, ID (1) | Sheet Metal Contractor in Firth, ID (1) |
| State Government - Executive Offices in Firth, ID (1) | Steam Cleaning - Industrial in Firth, ID (1) |
| Structural Metal Fabrication in Firth, ID (1) | Transportation in Firth, ID (1) |
| Trucking in Firth, ID (1) | Trucking Hauling Contractor in Firth, ID (1) |
