a town of northern France, capital of an arrondissement in the department of Seine-et-Marne, 45 m. E. of Paris by rail. Pop. (1906) 5217. It is situated in the fertile district of Brie, in a valley watered by the Grand-Morin. The church of St Denis (13th and 16th centuries), and the ruins of a castle built by Catherine of Gonzaga, duchess of Longueville, in the early 17th century, are of little importance. There is a statue to Commandant Beaurepaire, who, in 1792, killed himself rather than surrender Verdun to the Prussians. Coulommiers is the seat of a subprefect, and has a tribunal of first instance and a communal college. Printing is the chief industry, tanning, flour-milling and sugar-making being also carried on. Trade is in agricultural products, and especially in cheeses named after the town.