What was Jackie Robinson's primary position?

Jackie Robinson’s primary position was second base. Although he played several positions during his career, he spent most of his major-league years as the Brooklyn Dodgers’ second baseman.

Robinson actually began his 1947 rookie season at first base because Eddie Stanky was established at second. After Stanky was traded to the Boston Braves in March 1948, Robinson moved to second base and made it his defining position. He led the National League in fielding among second basemen in both 1950 and 1951, combining reliable defense with speed and aggressive baserunning.

The other positions are understandable distractors because Robinson was versatile. He played third base and the outfield later in his career, and historical accounts credit him with strong defensive ability at virtually every position he tried. Still, “second baseman” is the standard biographical description and the single best answer to this question. His offensive impact was equally important: he finished with a .313 career batting average, 141 home runs, and 197 stolen bases over ten major-league seasons.