<p>The Magellanic penguin <i>Spheniscus magellanicus</i> is one of the emblematic species of the Argentine Atlantic coast, and its population dynamics provide valuable information for coastal ecosystem monitoring. Despite its wide distribution, colony abundance and spatial configuration along the Argentine coast have undergone significant changes in recent decades. This study aims to characterize the current status and trends of breeding colonies throughout its distribution along the Argentine Atlantic coast. Together with our own surveys we conducted an exhaustive literature review, integrating more than three decades of published and unpublished information on 65 active breeding colonies distributed from Río Negro to Tierra del Fuego, including the Malvinas/Falkland Islands. Abundance estimates were compiled and analyzed by colony, allowing for the evaluation of individual trends and the estimation of an overall population trend for the species in the country. While trends varied among individual colonies, the overall results indicate a moderate, although not statistically significant, multi-decadal population increase of approximately 2% per year, based on colony-specific trends derived from long-term monitoring data. Based on individual colony trends, total abundances were estimated, projecting approximately 1.28 million breeding pairs by the year 2024. Although regional differences were found, there is a sustained increase in the total number of active colonies, an expansion into new areas, and growth in several already established colonies. This result contrasts with previous perceptions of widespread decline and reinforces evidence of a reconfiguration in the species’ breeding distribution. These changes respond to a combination of ecological factors, dispersal processes, and variations in anthropogenic pressure. The findings highlight the importance of maintaining systematic monitoring programs and adapting conservation strategies to the spatial and temporal dynamism observed.</p>