| Index | Harlem | Montana | National |
| Income per capita | $34,627 | $39,875 | $44,883 |
| Median household income | $76,214 | $71,326 | $81,333 |
| Median income owner occupied | $87,833 | $88,680 | $106,172 |
| Median income renter occupied | $60,322 | $45,249 | $52,080 |
| Median earnings male | $36,271 | $47,130 | $54,343 |
| Median earnings female | $46,666 | $32,153 | $38,439 |
| Unemployment rate | 5.4% | 3.8% | 4.9% |
| Poverty level | 16.4% | 14.9% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 2.9% | 2.9% |
| Manufacturing sector | 0.0% | 0.0% |
| Financial & insurance services | 2.3% | 2.3% |
| Wholesale & retail services | 35.8% | 35.8% |
| Public administration | 14.5% | 14.5% |
| Transportation, warehousing & utilities | 6.9% | 6.9% |
| Education, health & social services | 14.5% | 14.5% |
| Other | 23.1% | 23.1% |
| City | Population | Household Income | National Avg. |
| Fort Belknap Agency, MT | 1,572 | $67,770 | 16.7% |
| Harlem, MT | 893 | $76,214 | 6.3% |
| City | Population | Household Income | National Avg. |
| Alpaugh, CA | 893 | $38,656 | 52.5% |
| Watkins, MN | 893 | $77,408 | 4.8% |
| Notre-Dame-de-la-Merci, QC | 893 | n/a | |
| Excel, AL | 892 | $86,361 | 6.2% |
| Rancho Mesa Verde, AZ | 892 | $38,175 | 53.1% |
| Harlem, MT | 893 | $76,214 | 6.3% |