| | Portland, TN | Earlham, IA | United States |
| Commute Time | 29 | 23 | 27 |
| space | | | |
| Commute Mode | | | |
| | Portland, TN | Earlham, IA | United States |
| Auto (alone) | 79.9% | 73.8% | 73.2% |
| Carpool | 12.4% | 10.9% | 8.6% |
| Mass Transit | 0.0% | 0.0% | 4.2% |
| Bicycle | 0.4% | 0.0% | 0.5% |
| Walk | 0.3% | 1.9% | 2.5% |
| Work at Home | 5.8% | 13.5% | 9.7% |
| space1 | | | |
| Commute Time To Work | | | |
| | Portland, TN | Earlham, IA | United States |
| Commute Less Than 5 min. | 3.7% | 11.4% | 2.9% |
| Commute 6 to 9 min. | 13.9% | 11.7% | 9.5% |
| Commute 10 to 14 min. | 20.5% | 2.7% | 13.2% |
| Commute 15 to 19 min. | 7.2% | 6.1% | 15.2% |
| Commute 20 to 24 min. | 7.2% | 6.0% | 14.3% |
| Commute 25 to 29 min. | 4.2% | 16.8% | 6.7% |
| Commute 30 to 34 min. | 12.2% | 23.7% | 13.7% |
| Commute 35 to 39 min. | 2.5% | 10.4% | 3.1% |
| Commute 40 to 44 min. | 5.0% | 3.1% | 4.0% |
| Commute 45 to 59 min. | 11.0% | 7.1% | 8.2% |
| Commute 60 to 89 min. | 9.4% | 0.9% | 6.2% |
| Commute greater than 90 min. | 3.2% | 0.0% | 2.9% |