Go to the US Census Bureau's Income site and try their Data pages:
Or, use the Census Bureau Microdata Access Tool to create relevant data tables using the Current Population Survey (CPS) Annual Social and Economic (March) Supplement or American Community Survey (ACS) 1-Year Public Use Microdata Sample data.
Go to Earnings - Labor Force Statistics (BLS). This site provides typical hourly and weekly earnings of wage and salary workers from the most recent "Current Population Survey".
Structure of Earnings Survey (SES) on Eurostat provides comparable information at EU-level on relationships between the level of earnings, individual characteristics of employees (sex, age, occupation, length of service, educational level) and their employer (economic activity, size of the enterprise, etc.) for reference years 2002, 2006, 2010, 2014, and 2018.
For data on Spain consult Encuesta trimestral de coste laboral. Últimos datos (in Spanish) on the INE website.
