The Progressive Map Service (fl. c. 1910 - c. 1945) was a American map publishing company active in Fresno, California, during the first half of the 20th century. The firm, which was owned and run by Dan W. Chamberlin, specialized in southern California city and county maps. Most of their maps are a synthesis of government, county and private survey work. Unfortunately, little is known of Chamberlin or the company's operations.