E. C. Kropp Co. was a publishing and printing company based in Milwaukee, Wisconsin, active from 1907 to 1956. The company originated as a publisher and printer in 1898. They produced a wide variety of lithographic postcards featuring views and other subjects, ranging from early pioneers to fine-grain linens.
In 1956, the company was sold to L.L. Cook. Presently, they are part of the GAF Corp.