- Data only includes miles travelled on county roads. It does not include miles travelled on city, state or federal roads and highways.
- Lack of a visible bar can occur when the number is so small the result is a bar less than one pixel in height.
| Data for the Mills County Road Miles Chart |
|---|
| Calendar Year | Number of All Vehicle Miles | Change from Prior Year | Number of Truck Miles | Change from Prior Year |
|---|
| 2005 | 15,640.732 | N/A | 491.931 | N/A |
| 2006 | 15,640.732 | 0.0% | 491.931 | 0.0% |
| 2007 | 18,596.940 | 18.9% | 595.098 | 21.0% |
| 2008 | 17,858.744 | -4.0% | 570.003 | -4.2% |
| 2009 | 17,858.148 | 0.0% | 569.986 | 0.0% |
| 2010 | 17,772.654 | -0.5% | 568.725 | -0.2% |
| 2011 | 17,797.987 | 0.1% | 568.070 | -0.1% |
| 2012 | 16,912.711 | -5.0% | 539.741 | -5.0% |
| 2013 | 16,912.711 | 0.0% | 541.207 | 0.3% |
| 2014 | 16,912.627 | 0.0% | 541.204 | 0.0% |
| 2015 | 16,912.627 | 0.0% | 541.204 | 0.0% |
| 2016 | 16,912.627 | 0.0% | 541.204 | 0.0% |
| 2017 | 8,942.193 | -47.1% | 102.409 | -81.1% |
| 2018 | 9,093.328 | 1.7% | 115.777 | 13.1% |
| 2019 | 10,361.087 | 13.9% | 507.456 | 338.3% |
| 2020 | 14,111.055 | 36.2% | 1,047.883 | 106.5% |
| 2021 | 14,110.979 | 0.0% | 1,029.489 | -1.8% |
| 2022 | 17,836.618 | 26.4% | 443.267 | -56.9% |