| Index | Plymouth | Indiana | National |
| Income per capita | $32,507 | $39,271 | $44,883 |
| Median household income | $59,392 | $75,463 | $81,333 |
| Median income owner occupied | $76,088 | $93,561 | $106,172 |
| Median income renter occupied | $46,056 | $44,330 | $52,080 |
| Median earnings male | $46,834 | $53,211 | $54,343 |
| Median earnings female | $26,319 | $34,936 | $38,439 |
| Unemployment rate | 2.7% | 4.6% | 4.9% |
| Poverty level | 21.1% | 15.0% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 7.1% | 7.1% |
| Manufacturing sector | 53.8% | 53.8% |
| Financial & insurance services | 0.6% | 0.6% |
| Wholesale & retail services | 7.7% | 7.7% |
| Public administration | 1.0% | 1.0% |
| Transportation, warehousing & utilities | 4.0% | 4.0% |
| Education, health & social services | 10.3% | 10.3% |
| Other | 14.1% | 14.1% |
| City | Population | Household Income | National Avg. |
| Fish Lake, IN | 1,362 | $111,184 | 36.7% |
| La Paz, IN | 654 | $93,987 | 15.6% |
| Bourbon, IN | 1,982 | $91,525 | 12.5% |
| Bass Lake, IN | 1,373 | $89,469 | 10.0% |
| Etna Green, IN | 577 | $85,069 | 4.6% |
| Plymouth, IN | 10,366 | $59,392 | 27.0% |
| City | Population | Household Income | National Avg. |
| Le Mars, IA | 10,368 | $101,661 | 25.0% |
| Ventnor City, NJ | 10,370 | $81,871 | 0.7% |
| Fountain Inn, SC | 10,371 | $98,377 | 21.0% |
| Rideau Lakes, ON | 10,371 | n/a | |
| Chalco, NE | 10,372 | $112,191 | 37.9% |
| Plymouth, IN | 10,366 | $59,392 | 27.0% |