| Corn Farm Whol Livestock Soybean Farm in Letcher, SD (8) | Cattle Ranching in Letcher, SD (6) |
| General Crop Farm in Letcher, SD (6) | Restaurants in Letcher, SD (4) |
| Beauty Salons in Letcher, SD (3) | Cattle Feedlot in Letcher, SD (3) |
| Churches in Letcher, SD (3) | Bars in Letcher, SD (2) |
| Cash Grains Farm in Letcher, SD (2) | Farm Equipment - Repairing & Parts in Letcher, SD (2) |
| Gas - Liquefied Petro - Bttld Bulk (Whol) in Letcher, SD (2) | General Animal Farm in Letcher, SD (2) |
| Libraries - Public in Letcher, SD (2) | Salvage & Surplus Merchandise in Letcher, SD (2) |
| Trucking Operator - Nonlocal in Letcher, SD (2) | Uniforms in Letcher, SD (2) |
| Aerial Applicators in Letcher, SD (1) | Ambulance Service in Letcher, SD (1) |
| Animal Feed & Supplies Nursery in Letcher, SD (1) | Animal Services in Letcher, SD (1) |
| Banks in Letcher, SD (1) | Business Consulting Services in Letcher, SD (1) |
| Carpentry Contractor in Letcher, SD (1) | Dairies in Letcher, SD (1) |
| Demolition Contractors in Letcher, SD (1) | Diner in Letcher, SD (1) |
| Elementary Secondary School in Letcher, SD (1) | Environmental Excavating Contractor in Letcher, SD (1) |
| Excavating Contractors in Letcher, SD (1) | Executive Office in Letcher, SD (1) |
| Farm Equipment (Wholesale) in Letcher, SD (1) | Farms in Letcher, SD (1) |
| Fashion Designers in Letcher, SD (1) | Fire Departments in Letcher, SD (1) |
| Fire Protection in Letcher, SD (1) | General Contractors in Letcher, SD (1) |
| General Livestock Farm in Letcher, SD (1) | Grain Elevators in Letcher, SD (1) |
| Halls & Auditoriums in Letcher, SD (1) | Heavy Equipment Repair & Mfg Mechanical Equipment in Letcher, SD (1) |
| Hog Farm Or Feedlot in Letcher, SD (1) | Hotels & Motels in Letcher, SD (1) |
| House Construction Contractors in Letcher, SD (1) | Hunting & Fishing Preserves in Letcher, SD (1) |
| Inns in Letcher, SD (1) | Library Executive Office in Letcher, SD (1) |
| Material Handling Equipment (Wholesale) in Letcher, SD (1) | Mfg Games Toys in Letcher, SD (1) |
| Mfg Transportation Equipment Transportation Services in Letcher, SD (1) | Oils - Fuel (Wholesale) in Letcher, SD (1) |
| Paving Contractors in Letcher, SD (1) | Post Offices in Letcher, SD (1) |
| Retreat Houses in Letcher, SD (1) | Schools in Letcher, SD (1) |
| Senior Citizens Service in Letcher, SD (1) | Service Stations - Gasoline & Oil in Letcher, SD (1) |
| Skilled Nursing Care Facility in Letcher, SD (1) | Soybean Farm Corn Farm in Letcher, SD (1) |
| State Bank in Letcher, SD (1) | Tire - Dealers - Retail in Letcher, SD (1) |
| Truck Accessories (Wholesale) in Letcher, SD (1) | Truck Equipment & Parts - Manufacturers in Letcher, SD (1) |
| Unclassified in Letcher, SD (1) | Us Postal Service in Letcher, SD (1) |
| Veterans & Military Organizations in Letcher, SD (1) | Water Well Drilling in Letcher, SD (1) |
| Well Drilling in Letcher, SD (1) | Whol Petroleum Products Gasoline Service Station in Letcher, SD (1) |
| Whol Scrap Waste Material in Letcher, SD (1) | Wholesale Tires Tubes in Letcher, SD (1) |
| Windows in Letcher, SD (1) | Wood Products (Manufacturers) in Letcher, SD (1) |
| Woodworkers in Letcher, SD (1) |
