| Index | Cobb Island | Maryland | National |
| Income per capita | $59,043 | $55,489 | $44,883 |
| Median household income | $0 | $112,126 | $81,333 |
| Median income owner occupied | $0 | $142,381 | $106,172 |
| Median income renter occupied | $214,667 | $70,540 | $52,080 |
| Median earnings male | $68,156 | $69,331 | $54,343 |
| Median earnings female | $78,029 | $51,519 | $38,439 |
| Unemployment rate | 2.6% | 4.8% | 4.9% |
| Poverty level | 1.7% | 9.9% | 15.1% |

| 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. |
| Leonardtown, MD | 3,918 | $180,579 | 122.0% |
| Potomac Mills, VA | 7,096 | $175,267 | 115.5% |
| Dahlgren, VA | 3,645 | $149,870 | 84.3% |
| Mechanicsville, MD | 1,765 | $147,785 | 81.7% |
| Rock Point, MD | 64 | $126,811 | 55.9% |
| Cobb Island, MD | 1,145 | $0 | 100.0% |
| City | Population | Household Income | National Avg. |
| Hotevilla-Bacavi, AZ | 1,145 | $43,460 | 46.6% |
| Pleasant Hill, IL | 1,145 | $65,982 | 18.9% |
| Parker City, IN | 1,145 | $71,931 | 11.6% |
| Dodson Branch, TN | 1,145 | $67,489 | 17.0% |
| Preeceville, SK | 1,145 | n/a | |
| Cobb Island, MD | 1,145 | $0 | 100.0% |