| Index | Mercedes | Texas | National |
| Income per capita | $26,438 | $41,777 | $44,883 |
| Median household income | $58,108 | $80,880 | $81,333 |
| Median income owner occupied | $83,960 | $107,635 | $106,172 |
| Median income renter occupied | $29,430 | $54,463 | $52,080 |
| Median earnings male | $35,452 | $53,620 | $54,343 |
| Median earnings female | $25,132 | $36,296 | $38,439 |
| Unemployment rate | 4.6% | 4.3% | 4.9% |
| Poverty level | 25.5% | 16.7% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 10.9% | 10.9% |
| Manufacturing sector | 8.6% | 8.6% |
| Financial & insurance services | 0.2% | 0.2% |
| Wholesale & retail services | 16.1% | 16.1% |
| Public administration | 3.5% | 3.5% |
| Transportation, warehousing & utilities | 6.2% | 6.2% |
| Education, health & social services | 13.4% | 13.4% |
| Other | 37.6% | 37.6% |
| City | Population | Household Income | National Avg. |
| Progreso Lakes, TX | 340 | $162,476 | 99.8% |
| Zapata Ranch, TX | 220 | $136,394 | 67.7% |
| Relampago, TX | 395 | $123,278 | 51.6% |
| Palm Valley, TX | 1,960 | $111,800 | 37.5% |
| Murillo, TX | 9,633 | $90,750 | 11.6% |
| Mercedes, TX | 16,898 | $58,108 | 28.6% |
| City | Population | Household Income | National Avg. |
| Storrs, CT | 16,897 | $37,794 | 53.5% |
| Washington, IL | 16,894 | $115,059 | 41.5% |
| Heber, UT | 16,894 | $120,485 | 48.1% |
| Hillcrest Heights, MD | 16,890 | $100,785 | 23.9% |
| Menomonie, WI | 16,888 | $65,359 | 19.6% |
| Mercedes, TX | 16,898 | $58,108 | 28.6% |