| Index | Grosses-Roches | Quebec | National |
| Cost of living | 80 | 82 | 100 |
| Goods & Services | 107 | 84 | 100 |
| Groceries | 102 | 100 | 100 |
| Health care | 90 | 102 | 100 |
| Housing | 13 | 62 | 100 |
| Transportation | 95 | 100 | 100 |
| Utilities | 146 | 84 | 100 |
| Cost of living index | |
| Goods & Services index | |
| Groceries index | |
| Health care index | |
| Housing index | |
| Transportation index | |
| Utilities index |
| State | General Sales Tax | With Max Surtax |
| Quebec | 9.975% | 14.975% |
| State | Income Tax (Low) | Income Tax (High) |
| Quebec | 15% | 25.75% |
| Item | Grosses-Roches | National avg. | Difference |
| Personal Care | $80.00 | $94.33 | 15.2% |
| Recreation | $99.00 | $102.33 | 3.3% |
| Item | Grosses-Roches | National avg. | Difference |
| Meat, Poultry and Fish | $92.00 | $102.27 | 10.0% |
| Dairy Products and Eggs | $100.00 | $104.67 | 4.5% |
| Bakery and Cereal Products | $106.00 | $111.67 | 5.1% |
| Fruit and Vegetables | $103.00 | $113.40 | 9.2% |
| Alcoholic Beverages | $103.00 | $105.80 | 2.6% |
| Item | Grosses-Roches | National avg. | Difference |
| Doctor | $99.00 | $101.07 | 2.0% |
| Item | Grosses-Roches | National avg. | Difference |
| Home Price ($) | $n/a | $659,395.00 | 100.0% |
| Apartment Rent ($) | $n/a | $2,146.00 | 100.0% |
| Item | Grosses-Roches | National avg. | Difference |
| Gasoline | $99.00 | $102.07 | 3.0% |
| Item | Grosses-Roches | National avg. | Difference |
| All Electricity | $94.00 | $98.60 | 4.7% |
| City | Population | Cost of Living Index | National Avg. |
| Saint-Jean-de-Cherbourg, QC | 152 | 79 | 21.5% |
| Sainte-Félicité, QC | 1,019 | 81 | 19.5% |
| Les Méchins, QC | 911 | 80 | 20.3% |
| Saint-Adelme, QC | 514 | 81 | 19.0% |
| Grosses-Roches, QC | 386 | 80 | 19.9% |
| City | Population | Cost of Living Index | National Avg. |
| Newington, GA | 386 | n/a | |
| Addieville, IL | 386 | n/a | |
| Carbon Hill, IL | 386 | n/a | |
| Clear Lake, IL | 386 | n/a | |
| Hartsburg, IL | 386 | n/a | |
| Grosses-Roches, QC | 386 | 80 | 19.9% |