| Index | Plymouth | Illinois | National |
| Income per capita | $39,269 | $47,397 | $44,883 |
| Median household income | $69,054 | $88,967 | $81,333 |
| Median income owner occupied | $67,201 | $111,557 | $106,172 |
| Median income renter occupied | $0 | $52,117 | $52,080 |
| Median earnings male | $67,529 | $60,185 | $54,343 |
| Median earnings female | $0 | $40,368 | $38,439 |
| Unemployment rate | 7.9% | 6.6% | 4.9% |
| Poverty level | 21.1% | 14.0% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 12.0% | 12.0% |
| Manufacturing sector | 3.2% | 3.2% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 32.8% | 32.8% |
| Public administration | 0.0% | 0.0% |
| Transportation, warehousing & utilities | 23.2% | 23.2% |
| Education, health & social services | 8.0% | 8.0% |
| Other | 20.8% | 20.8% |
| City | Population | Household Income | National Avg. |
| Bentley, IL | 18 | $112,776 | 38.7% |
| Carthage, IL | 2,563 | $107,134 | 31.7% |
| La Prairie, IL | 65 | $100,012 | 23.0% |
| Bowen, IL | 599 | $87,213 | 7.2% |
| Golden, IL | 715 | $78,743 | 3.2% |
| Plymouth, IL | 451 | $69,054 | 15.1% |
| City | Population | Household Income | National Avg. |
| Lake City, CO | 451 | $58,618 | 27.9% |
| Groton Long Point, CT | 451 | $163,558 | 101.1% |
| Bonnie, IL | 451 | $86,748 | 6.7% |
| Kewanna, IN | 451 | $46,614 | 42.7% |
| Tolchester, MD | 451 | $189,282 | 132.7% |
| Plymouth, IL | 451 | $69,054 | 15.1% |