How Do You Rate?
The overall National average seat-belt use in 2015 was 88.5%. The Western States have the highest average with 95.0% and the Midwest has a ways to go coming in at 81.7%.
As you can image, States that have Primary Seat Belt laws (an officer can ticket you for the sole reason you are not wearing a seat-belt) have a higher rate of seat belt use as compared to States that have secondary enforcement laws (requires an officer to pull you over for another reason before you can receive a citation for not using your seat belt.)
Source: National Highway Traffic Safety Administration Report No. DOT HS 812 243