| Index | Castlewood | South Dakota | National |
| Cost of living index | 85 | 90 | 100 |
| Index | Castlewood | South Dakota | National |
| Goods & Services index | 98 | 95 | 100 |
| Groceries index | 95 | 99 | 100 |
| Health care index | 109 | 104 | 100 |
| Housing index | 58 | 77 | 100 |
| Transportation index | 94 | 94 | 100 |
| Utilities index | 89 | 93 | 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 | $13.62 | $16.09 | 15.3% |
| Beauty Salon | $28.24 | $37.33 | 24.4% |
| Toothpaste | $2.74 | $2.45 | 12.1% |
| Shampoo | $0.95 | $1.00 | 4.8% |
| Movie | $9.39 | $10.28 | 8.7% |
| Bowling | $4.14 | $4.93 | 16.0% |
| Item | Castlewood | National avg. | Difference |
| Ground Beef | $2.86 | $3.80 | 24.8% |
| Fried Chicken | $1.31 | $1.40 | 6.0% |
| Milk | $2.02 | $2.01 | 0.6% |
| Potatoes | $2.06 | $3.01 | 31.5% |
| Pizza | $10.68 | $9.89 | 8.1% |
| Beer | $8.61 | $8.90 | 3.2% |
| Item | Castlewood | National avg. | Difference |
| Optometrist | $119.54 | $102.16 | 17.0% |
| Doctor | $124.44 | $108.36 | 14.8% |
| Dentist | $97.87 | $92.53 | 5.8% |
| Ibuprofen | $8.99 | $9.28 | 3.1% |
| Lipitor | $460.07 | $425.82 | 8.0% |
| Item | Castlewood | National avg. | Difference |
| Home Price | $103,600.00 | $184,700.00 | 43.9% |
| Avg. Mortgage Payment | $1,058.27 | $1,202.44 | 12.0% |
| Apartment Rent | $605.00 | $949.00 | 36.2% |
| Item | Castlewood | National avg. | Difference |
| Gasoline | $2.16 | $2.24 | 3.7% |
| Tire Balancing | $41.34 | $46.29 | 10.7% |
| Item | Castlewood | National avg. | Difference |
| All Electricity | $147.73 | $165.96 | 11.0% |
| Phone | $25.75 | $28.68 | 10.2% |
| City, State | Population | Cost of Living Index | National Avg. |
| Goodwin, SD | 125 | 81 | -19% |
| Lake Norden, SD | 479 | 82 | -18% |
| Hayti, SD | 415 | 82 | -18% |
| Estelline, SD | 882 | 83 | -17% |
| Kranzburg, SD | 167 | 83 | -17% |
| Castlewood, SD | 609 | 85 | -15% |
| City, State | Population | Cost of Living Index | National Avg. |
| Madison, CA | 609 | 106 | 6% |
| Evansville, MN | 609 | 89 | -11% |
| Whitesburg, GA | 609 | 83 | -17% |
| Scotland, TX | 609 | 76 | -24% |
| New Washington, IN | 609 | 90 | -10% |
| Castlewood, SD | 609 | 85 | -15% |