Techniques for memory-efficient streaming count estimation for multisets are described. A method for memory-efficient streaming count estimation for multisets may include obtaining data from a plurality of data sources, and estimating a count for one or more attributes of the data using a telescoping count-min sketch (CMS) data structure, the telescoping CMS including at least a first table and a second table, wherein count values for the data are stored in a plurality of cells of the first table and when a cell of the first table is saturated, the count values for that cell are stored in a corresponding cell of the second table determined based at least on the cell of the first table.