| Index | Marathon | Florida | National |
| Income per capita | $59,850 | $40,554 | $44,883 |
| Median household income | $83,411 | $72,078 | $81,333 |
| Median income owner occupied | $120,676 | $88,075 | $106,172 |
| Median income renter occupied | $63,649 | $51,794 | $52,080 |
| Median earnings male | $53,262 | $45,688 | $54,343 |
| Median earnings female | $39,890 | $37,493 | $38,439 |
| Unemployment rate | 5.4% | 5.2% | 4.9% |
| Poverty level | 9.4% | 16.1% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 16.3% | 16.3% |
| Manufacturing sector | 2.3% | 2.3% |
| Financial & insurance services | 0.2% | 0.2% |
| Wholesale & retail services | 13.6% | 13.6% |
| Public administration | 7.4% | 7.4% |
| Transportation, warehousing & utilities | 9.9% | 9.9% |
| Education, health & social services | 2.7% | 2.7% |
| Other | 46.1% | 46.1% |
| City | Population | Household Income | National Avg. |
| Duck Key, FL | 780 | $158,074 | 94.4% |
| Key Colony Beach, FL | 543 | $135,757 | 66.9% |
| Layton, FL | 110 | $76,077 | 6.5% |
| Marathon, FL | 8,934 | $83,411 | 2.6% |
| City | Population | Household Income | National Avg. |
| Stuttgart, AR | 8,933 | $73,032 | 10.2% |
| Kings Grant, NC | 8,935 | $69,200 | 14.9% |
| Graham, TX | 8,936 | $70,654 | 13.1% |
| Hanover, NH | 8,927 | $117,805 | 44.8% |
| Brigantine, NJ | 8,944 | $114,015 | 40.2% |
| Marathon, FL | 8,934 | $83,411 | 2.6% |