This research paper gives an overview of the problems faced by the courier delivery services, like Vehicle routing problem and cost minimization, and the various operations research techniques that have been applied to solve these problems. We have studied past research papers and collected some of the most efficient Operations Research techniques like the Recursive DBSCAN, CVRPPAD and travelling salesman problems. All these techniques and their application have been discussed in detail in the paper. All the techniques have their own advantages and limitations, which also, have been mentioned in this paper.