- 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 Polk County Road Miles Chart |
|---|
| Calendar Year | Number of All Vehicle Miles | Change from Prior Year | Number of Truck Miles | Change from Prior Year |
|---|
| 2005 | 93,574.552 | N/A | 2,651.852 | N/A |
| 2006 | 93,574.552 | 0.0% | 2,651.852 | 0.0% |
| 2007 | 93,574.552 | 0.0% | 2,994.390 | 12.9% |
| 2008 | 61,835.295 | -33.9% | 1,809.295 | -39.6% |
| 2009 | 63,871.825 | 3.3% | 1,872.833 | 3.5% |
| 2010 | 62,332.485 | -2.4% | 1,994.640 | 6.5% |
| 2011 | 62,569.850 | 0.4% | 2,002.235 | 0.4% |
| 2012 | 62,599.075 | 0.0% | 2,003.170 | 0.0% |
| 2013 | 63,681.825 | 1.7% | 2,037.818 | 1.7% |
| 2014 | 64,297.470 | 1.0% | 2,057.519 | 1.0% |
| 2015 | 64,297.470 | 0.0% | 2,057.519 | 0.0% |
| 2016 | 64,297.470 | 0.0% | 2,057.519 | 0.0% |
| 2017 | 64,079.005 | -0.3% | 2,321.990 | 12.9% |
| 2018 | 56,342.194 | -12.1% | 2,281.011 | -1.8% |
| 2019 | 56,703.195 | 0.6% | 1,629.427 | -28.6% |
| 2020 | 57,130.236 | 0.8% | 1,721.929 | 5.7% |
| 2021 | 58,583.500 | 2.5% | 1,760.256 | 2.2% |
| 2022 | 59,968.190 | 2.4% | 2,420.291 | 37.5% |