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In the United States (the most common context for this query), the average yearly salary in 1955 depended on how it’s measured and for whom.
• The median income for men (who were the primary earners at the time) was $3,400, according to U.S. Census Bureau data. This is often cited as a proxy for the typical individual salary.
• The median family income was $4,400 (reflecting households that often had one main wage earner plus possible secondary income).
• For full-time, year-round workers, average annual earnings were higher—around $4,700 for men in the late 1950s (specific 1955 figures align closely with the Census medians for broader populations).
These figures are in 1955 dollars and come from official U.S. Census Bureau reports (e.g., Current Population Reports P-60 series). Note that “average” here typically refers to the median, as it better represents the typical experience (means can be skewed by high earners).