| | Johnston, IA | Grimes, IA | United States |
| Commute Time | 19 | 19 | 27 |
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| Commute Mode | | | |
| | Johnston, IA | Grimes, IA | United States |
| Auto (alone) | 84.0% | 73.4% | 73.2% |
| Carpool | 4.7% | 4.0% | 8.6% |
| Mass Transit | 0.2% | 0.0% | 4.2% |
| Bicycle | 0.4% | 0.7% | 0.5% |
| Walk | 0.4% | 2.4% | 2.5% |
| Work at Home | 9.8% | 19.4% | 9.7% |
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| Commute Time To Work | | | |
| | Johnston, IA | Grimes, IA | United States |
| Commute Less Than 5 min. | 2.9% | 5.5% | 2.9% |
| Commute 6 to 9 min. | 13.5% | 8.9% | 9.5% |
| Commute 10 to 14 min. | 13.7% | 11.3% | 13.2% |
| Commute 15 to 19 min. | 16.5% | 23.0% | 15.2% |
| Commute 20 to 24 min. | 28.4% | 20.1% | 14.3% |
| Commute 25 to 29 min. | 13.1% | 15.8% | 6.7% |
| Commute 30 to 34 min. | 5.4% | 10.1% | 13.7% |
| Commute 35 to 39 min. | 0.8% | 0.3% | 3.1% |
| Commute 40 to 44 min. | 1.5% | 3.9% | 4.0% |
| Commute 45 to 59 min. | 3.0% | 1.1% | 8.2% |
| Commute 60 to 89 min. | 0.3% | 0.0% | 6.2% |
| Commute greater than 90 min. | 0.9% | 0.0% | 2.9% |