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Wireless networks have become increasingly popular. They can provide mobile users with ubiquitous communication capability and information access regardless of locations. In this paper, we evaluate the throughput of wireless multihop networks by simulations. For simulations, we used ns-3 network simulator considering Ad hoc On-Demand Distance Vector (AODV), Optimized Link State Routing (OLSR) and Destination-Sequenced Distance-Vector (DSDV) routing protocols. We also evaluate the average throughput, the average packets received rate and the percentage of Constant Bit Rate (CBR) for different area sizes and different number of nodes. The evaluation results show that OLSR has the best performance than other protocols for smaller area.