| Index | Cobb Island | Maryland | National |
| Income per capita | $40,406 | $37,756 | $29,829 |
| Median household income | $0 | $76,067 | $55,322 |
| Median income owner occupied | $0 | $95,994 | $70,586 |
| Median income renter occupied | $145,550 | $47,333 | $35,192 |
| Median earnings male | $47,152 | $46,495 | $36,919 |
| Median earnings female | $53,200 | $35,612 | $26,250 |
| Unemployment rate | 2.5% | 4.5% | 4.7% |
| Poverty level | 1.7% | 9.9% | 15.1% |


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| Labour Type | Male | Female |
| Construction industry | 35.5% | 35.5% |
| Manufacturing sector | 15.1% | 15.1% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 4.5% | 4.5% |
| Public administration | 28.2% | 28.2% |
| Transportation, warehousing & utilities | 0.0% | 0.0% |
| Education, health & social services | 4.0% | 4.0% |
| Other | 12.7% | 12.7% |
| City | Population | Household Income | National Avg. |
| Potomac Mills, VA | 6,826 | $119,615 | 116.2% |
| Leonardtown, MD | 3,795 | $119,250 | 115.6% |
| Mechanicsville, MD | 1,724 | $99,041 | 79.0% |
| Dahlgren, VA | 3,528 | $98,849 | 78.7% |
| Rock Point, MD | 63 | $86,750 | 56.8% |
| Cobb Island, MD | 1,119 | $0 | 100.0% |
| City | Population | Household Income | National Avg. |
| North DeLand, FL | 1,119 | $33,693 | 39.1% |
| Parkers Prairie, MN | 1,119 | $53,036 | 4.1% |
| Twin Lakes, NM | 1,119 | $22,857 | 58.7% |
| Springmont, PA | 1,119 | $138,819 | 150.9% |
| Sainte-Marthe, QC | 1,119 | n/a | |
| Cobb Island, MD | 1,119 | $0 | 100.0% |