| Statistic | Plymouth | Nebraska | National |
| Population | 424 | 1,934,408 | 328,239,523 |
| Population density (sq mi) | 1,344 | 25 | 91 |
| Median age | 49.5 | 36.2 | 37.7 |
| Male/Female ratio | 1.2:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 67% | 59% | 55% |
| Families w/ Kids under 18 | 35% | 45% | 43% |
| Speak English | 100% | 89% | 79% |
| Speak Spanish | 0% | 7% | 13% |
| Race | Plymouth | Nebraska | National |
| White | 97.17% | 88.01% | 73.35% |
| Black | 0.00% | 4.70% | 12.63% |
| Asian | 0.00% | 2.12% | 5.22% |
| American Indian | 0.00% | 0.84% | 0.82% |
| Native Hawaiian | 0.00% | 0.07% | 0.18% |
| Mixed race | 2.83% | 2.32% | 3.06% |
| Other race | 0.00% | 1.95% | 4.75% |
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