| Index | Castlewood | South Dakota | National |
| Cost of living | 83 | 90 | 100 |
| Goods & Services | 96 | 96 | 100 |
| Groceries | 96 | 99 | 100 |
| Health care | 107 | 102 | 100 |
| Housing | 58 | 77 | 100 |
| Transportation | 91 | 96 | 100 |
| Utilities | 85 | 88 | 100 |
| Cost of living index | |
| Goods & Services index | |
| Groceries index | |
| Health care index | |
| Housing index | |
| Transportation index | |
| Utilities index |
| Median Income | Per Year | Per Month | Max Budget (28% DTI) | Max Budget (36% DTI) |
| Owners | $61,000 | $5,083 | $1,423 | $1,830 |
| Renters | $33,295 | $2,775 | $777 | $999 |
| State | General Sales Tax | With Max Surtax |
| South Dakota | 4% | 6% |
| State | Income Tax (Low) | Income Tax (High) |
| South Dakota | 0% | 0% |
| Item | Castlewood | National avg. | Difference |
| Haircut | $16.15 | $17.49 | 7.7% |
| Beauty Salon | $30.20 | $38.17 | 20.9% |
| Toothpaste | $2.13 | $2.32 | 8.2% |
| Shampoo | $1.13 | $1.01 | 11.7% |
| Movie | $9.75 | $10.72 | 9.1% |
| Bowling | $15.19 | $13.86 | 9.6% |
| Item | Castlewood | National avg. | Difference |
| Ground Beef | $3.19 | $3.90 | 18.2% |
| Fried Chicken | $1.91 | $1.40 | 36.8% |
| Milk | $2.13 | $1.96 | 8.6% |
| Potatoes | $2.49 | $3.18 | 21.8% |
| Pizza | $10.49 | $10.39 | 0.9% |
| Beer | $8.79 | $9.23 | 4.8% |
| Item | Castlewood | National avg. | Difference |
| Optometrist | $124.00 | $106.34 | 16.6% |
| Doctor | $142.50 | $115.25 | 23.6% |
| Dentist | $100.00 | $98.38 | 1.6% |
| Ibuprofen | $9.59 | $9.26 | 3.6% |
| Lipitor | $447.40 | $466.47 | 4.1% |
| Item | Castlewood | National avg. | Difference |
| Home Price | $103,600.00 | $184,700.00 | 43.9% |
| Avg. Mortgage Payment | $1,183.43 | $1,273.32 | 7.1% |
| Apartment Rent | $605.00 | $949.00 | 36.2% |
| Item | Castlewood | National avg. | Difference |
| Gasoline | $2.58 | $2.59 | 0.5% |
| Tire Balancing | $38.40 | $48.90 | 21.5% |
| Item | Castlewood | National avg. | Difference |
| All Electricity | $124.73 | $167.60 | 25.6% |
| Phone | $178.51 | $163.42 | 9.2% |
| City, State | Population | Cost of Living Index | National Avg. |
| Goodwin, SD | 125 | 79 | -21% |
| Lake Norden, SD | 479 | 80 | -20% |
| Hayti, SD | 415 | 81 | -19% |
| Estelline, SD | 882 | 81 | -19% |
| Kranzburg, SD | 167 | 82 | -18% |
| Castlewood, SD | 609 | 83 | -17% |
| City, State | Population | Cost of Living Index | National Avg. |
| Scotland, TX | 609 | 79 | -21% |
| Coalville, IA | 609 | 86 | -14% |
| Madison, CA | 609 | 109 | 9% |
| Evansville, MN | 609 | 93 | -7% |
| Whitesburg, GA | 609 | 83 | -17% |
| Castlewood, SD | 609 | 83 | -17% |
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