Numbeo.com and Cityrating.com offer free statistics for the average costs of living in the United States as of 2015. They provide stats for many purchase categories in the United States, as well.
Numbeo.com provides cost of living stats and seven other categories of statistics and comparisons that are specified by location. Numbeo.com boasts an impressive 2,133,776 prices entered by contributors.
Cityrating.com offers statistics on individual states and cities in the United States. They also offer a tool by which to compare the cost of living of any two U.S. cities. It prompts you to enter your salary and two cities for which you would like to compare the cost of living statistics. Cityrating.com also offers a list of its top 10 cities to live in the United States, a list that factors in crime, schooling and various other factors along with the cost of living.
If you are seeking to relocate, you can also use cityranking.com to look at several other categories of statistics regarding the state and city to which you might move. While Numbeo.com and Cityrating.com both offer impressive arrays of cost of living stats, the better option for the most precise U.S. cost of living statistics may be Cityrating.com.