One of the major issues in wireless sensor network is developing an energy-efficient routing protocol. Since the sensor nodes have limited available power, energy conservation is a critical issue in wireless sensor network for nodes and network life. There are several existing routing protocols to solve this problem. LEACH (Low-Energy Adaptive Clustering Hierarchy), a clustering-based protocol that utilizes randomized rotation of local cluster base stations (cluster-heads) to evenly distribute the energy load among the sensors in the network. LEACH has a drawback that the cluster is not evenly distributed due to its randomized rotation of local clusterhead. A new routing protocol has been proposed known as CIDRSN (Cluster ID based Routing in Sensor Networks). CIDRSN takes the cluster-ID as next hop address in routing table and eliminate the cluster formation phase and routing phase in each round. Both cluster formation phase and routing phase are only executed during the initialization of network. CIDRSN constructs clusters based on the number of cluster members. The cluster topology in the network is distributed more equally through our cluster constructing. And cluster heads for the next round will be elected based on the remaining battery level of the nodes. All routes are based on cluster-ID rather than cluster head ID. This reduces the energy consumption and increases network life time.