The surveys come from several kinds of sources. You'll want to evaluate the information in terms of currency, geographic coverage and application to your own situation. This link offers a number of salary indicators including a look at cost of living comparisons. However, do not take this information as fact.
Many factors combine to make up the actual pay rate offered by an employer.
The following material, taken primarily from the Bureau of Labor Statistics, includes the salary ranges and related earnings information for approximately 130 occupations. A search index created to find salary information on your chosen area of work.