| Index | Monmouth | Illinois | National |
| Income per capita | $23,687 | $31,502 | $29,829 |
| Median household income | $50,740 | $59,196 | $55,322 |
| Median income owner occupied | $62,787 | $75,354 | $70,586 |
| Median income renter occupied | $31,226 | $34,488 | $35,192 |
| Median earnings male | $26,824 | $40,474 | $36,919 |
| Median earnings female | $18,083 | $27,197 | $26,250 |
| Unemployment rate | 8.3% | 5.3% | 4.7% |
| Poverty level | 16.0% | 14.0% | 15.1% |


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| Labour Type | Male | Female |
| Construction industry | 3.0% | 3.0% |
| Manufacturing sector | 18.2% | 18.2% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 13.9% | 13.9% |
| Public administration | 1.4% | 1.4% |
| Transportation, warehousing & utilities | 12.9% | 12.9% |
| Education, health & social services | 24.2% | 24.2% |
| Other | 25.4% | 25.4% |
| City | Population | Household Income | National Avg. |
| Biggsville, IL | 438 | $87,143 | 57.5% |
| North Henderson, IL | 239 | $74,107 | 34.0% |
| Media, IL | 110 | $63,864 | 15.4% |
| Rio, IL | 206 | $62,500 | 13.0% |
| Seaton, IL | 278 | $59,583 | 7.7% |
| Monmouth, IL | 8,837 | $50,740 | 8.3% |
| City | Population | Household Income | National Avg. |
| Glencoe, IL | 8,836 | $195,600 | 253.6% |
| Clarendon Hills, IL | 8,834 | $103,486 | 87.1% |
| Whitestown, IN | 8,842 | $96,024 | 73.6% |
| Frankfort Square, IL | 8,831 | $113,170 | 104.6% |
| Sans Souci, SC | 8,844 | $37,108 | 32.9% |
| Monmouth, IL | 8,837 | $50,740 | 8.3% |