| Index | Fairfield | Montana | National |
| Income per capita | $39,941 | $39,875 | $44,883 |
| Median household income | $95,497 | $71,326 | $81,333 |
| Median income owner occupied | $95,341 | $88,680 | $106,172 |
| Median income renter occupied | $104,758 | $45,249 | $52,080 |
| Median earnings male | $76,851 | $47,130 | $54,343 |
| Median earnings female | $46,537 | $32,153 | $38,439 |
| Unemployment rate | 0.2% | 3.8% | 4.9% |
| Poverty level | 13.0% | 14.9% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 26.8% | 26.8% |
| Manufacturing sector | 0.0% | 0.0% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 11.8% | 11.8% |
| Public administration | 13.4% | 13.4% |
| Transportation, warehousing & utilities | 6.3% | 6.3% |
| Education, health & social services | 18.1% | 18.1% |
| Other | 18.1% | 18.1% |
| City | Population | Household Income | National Avg. |
| Simms, MT | 349 | $126,397 | 55.4% |
| Choteau, MT | 1,952 | $77,294 | 5.0% |
| Sun River, MT | 42 | $71,963 | 11.5% |
| Power, MT | 158 | $61,295 | 24.6% |
| Fort Shaw, MT | 144 | $0 | 100.0% |
| Fairfield, MT | 706 | $95,497 | 17.4% |
| City | Population | Household Income | National Avg. |
| Brownsdale, MN | 706 | $82,959 | 2.0% |
| Darby, MT | 706 | $44,497 | 45.3% |
| Rapids, NY | 706 | $0 | 100.0% |
| Zena, NY | 706 | $128,762 | 58.3% |
| Loon Lake, WA | 706 | $85,371 | 5.0% |
| Fairfield, MT | 706 | $95,497 | 17.4% |