Today, us-east-1 is the single largest AWS region. It generates an estimated 2.5GW capacity spread across 6 availability zones (AZs) and 158 data centers. In comparison, the second-largest region is us-west-1 in Oregon, with an estimated 1.7GW capacity spread across 4 availability zones (AZs) and 48 data centers. Not only is us-west-1 about smaller than us-east-1, but it also charges higher per-instance prices than us-east-1.