A Milk Collection Center (MCC) is a facility forcollecting raw milk supplied by a dairy farmer based onthe demand of a milk manufacturer. Raw milk of eachMCC is supplied from the dairy farm where is locatedwithin 20 kilometers length from the MCC. Raw milkcollection is one of logistics activities. A reduction in thecost of collecting raw milk is one of the goals ofeffectively managing raw milk supply chain. Somefarmers presently self-deliver raw milk to MCC. In thissituation, therefore, the transportation cost is increased assupply chain management view point.This research aims to reduce transportation cost ofcollecting raw milk paid by dairy farmer. GeographicInformation System (GIS) is used to input, store, retrieve,manipulate, analyze and output geographically referenceddata in order to support decision making. GIS database isconstructed to store input data such as road network, roadsection’s lengths, farm locations, raw milk quantity ofeach farm and other relevant data. Then, GIS software isused to determine the routing networks of raw milkcollection from dairy farms to MCC.The results showed that the total distance of all routes inthe network was reduced by 54.8 % and transportationcost was reduced by 37.9 %.