The Kerala Migration Survey (KMS), conducted by the Centre for Development Studies (CDS) in Thiruvananthapuram, is a pioneering initiative that has been studying international and internal migration from Kerala since the mid-1980s. Beginning with its first survey in 1998, KMS has completed seven rounds, covering all regions of Kerala and expanding from 10,000 households in 1998 to 25,000 in 2018. This rich dataset provides detailed, disaggregated data at the taluk level, offering valuable insights into emigration, return migration, remittances, and migration costs. KMS is widely regarded as the most reliable and authentic source of migration data, essential for researchers and policymakers alike. The 2018 survey marked KMS as the first exclusive migration survey series to span over two decades, making it a unique and invaluable resource in the global migration research landscape. Data from various rounds are available for download and analysis in multiple formats, encouraging extensive use for research purposes.