| Index | Montmagny | Quebec | National |
| Cost of living | 70 | 82 | 100 |
| Goods & Services | 84 | 84 | 100 |
| Groceries | 100 | 100 | 100 |
| Health care | 102 | 102 | 100 |
| Housing | 24 | 62 | 100 |
| Transportation | 100 | 100 | 100 |
| Utilities | 84 | 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 | Montmagny | National avg. | Difference |
| Personal Care | $106.00 | $94.33 | 12.4% |
| Recreation | $98.00 | $102.33 | 4.2% |
| Item | Montmagny | National avg. | Difference |
| Meat, Poultry and Fish | $100.00 | $102.27 | 2.2% |
| Dairy Products and Eggs | $102.00 | $104.67 | 2.5% |
| Bakery and Cereal Products | $103.00 | $111.67 | 7.8% |
| Fruit and Vegetables | $99.00 | $113.40 | 12.7% |
| Alcoholic Beverages | $92.00 | $105.80 | 13.0% |
| Item | Montmagny | National avg. | Difference |
| Doctor | $98.00 | $101.07 | 3.0% |
| Item | Montmagny | National avg. | Difference |
| Home Price ($) | $n/a | $659,395.00 | 100.0% |
| Apartment Rent ($) | $716.00 | $2,146.00 | 66.6% |
| Item | Montmagny | National avg. | Difference |
| Gasoline | $104.00 | $102.07 | 1.9% |
| Item | Montmagny | National avg. | Difference |
| All Electricity | $98.00 | $98.60 | 0.6% |
| City | Population | Cost of Living Index | National Avg. |
| Notre-Dame-du-Rosaire, QC | 386 | 67 | 32.7% |
| Sainte-Euphémie-sur-Rivière-du-Sud, QC | 311 | 68 | 32.3% |
| Armagh, QC | 1,432 | 68 | 31.9% |
| L'Islet, QC | 3,712 | 69 | 30.6% |
| Saint-Antoine-de-l'Isle-aux-Grues, QC | 140 | 70 | 30.4% |
| Montmagny, QC | 10,961 | 70 | 29.5% |
| City | Population | Cost of Living Index | National Avg. |
| Campton Hills, IL | 10,962 | n/a | |
| Dobbs Ferry, NY | 10,959 | n/a | |
| Morgan City, LA | 10,963 | n/a | |
| DeRidder, LA | 10,955 | n/a | |
| Placerville, CA | 10,954 | n/a | |
| Montmagny, QC | 10,961 | 70 | 29.5% |