Awesome
| Region Code | Region Name | Availability Zones |
|---|---|---|
| us-east-1 | N. Virginia | us-east-1a us-east-1b us-east-1c us-east-1d us-east-1e us-east-1f |
| us-east-2 | Ohio | us-east-2a us-east-2b us-east-2c |
| <sup>1</sup>us-west-1 | N. California | us-west-1a us-west-1b us-west-1c |
| us-west-2 | Oregon | us-west-2a us-west-2b us-west-2c us-west-2d |
| <sup>2</sup>us-gov-west-1 | US GovCloud West | us-gov-west-1a us-gov-west-1b us-gov-west-1c |
| <sup>2</sup>us-gov-east-1 | US GovCloud East | us-gov-east-1a us-gov-east-1b us-gov-east-1c |
| ca-central-1 | Canada | ca-central-1a ca-central-1b ca-central-1c ca-central-1d |
| eu-north-1 | Stockholm | eu-north-1a eu-north-1b eu-north-1c |
| eu-west-1 | Ireland | eu-west-1a eu-west-1b eu-west-1c |
| eu-west-2 | London | eu-west-2a eu-west-2b eu-west-2c |
| eu-west-3 | Paris | eu-west-3a eu-west-3b eu-west-3c |
| eu-central-1 | Frankfurt | eu-central-1a eu-central-1b eu-central-1c |
| eu-south-1 | Milan | eu-south-1a eu-south-1b eu-south-1c |
| af-south-1 | Cape Town | af-south-1a af-south-1b af-south-1c |
| <sup>1</sup>ap-northeast-1 | Tokyo | ap-northeast-1a ap-northeast-1b ap-northeast-1c ap-northeast-1d |
| ap-northeast-2 | Seoul | ap-northeast-2a ap-northeast-2b ap-northeast-2c ap-northeast-2d |
| ap-northeast-3 | Osaka | ap-northeast-3a ap-northeast-3b ap-northeast-3c |
| ap-southeast-1 | Singapore | ap-southeast-1a ap-southeast-1b ap-southeast-1c |
| ap-southeast-2 | Sydney | ap-southeast-2a ap-southeast-2b ap-southeast-2c |
| ap-east-1 | Hong Kong | ap-east-1a ap-east-1b ap-east-1c |
| ap-south-1 | Mumbai | ap-south-1a ap-south-1b ap-south-1c |
| me-south-1 | Bahrain | me-south-1a me-south-1b me-south-1c |
| <sup>1</sup>sa-east-1 | São Paulo | sa-east-1a sa-east-1b sa-east-1c |
| <sup>3</sup>cn-north-1 | Bejing | cn-north-1a cn-north-1b cn-north-1c |
| <sup>3</sup>cn-northwest-1 | Ningxia | cn-northwest-1a cn-northwest-1b cn-northwest-1c |
| ap-southeast-3 | Jakarta | ap-southeast-3a ap-southeast-3b ap-southeast-3c |
| coming soon | Spain | ... |
<sup>1</sup>To ensure that resources are distributed across the Availability Zones for these regions, they may differ for each AWS account. You can run aws ec2 describe-availability-zones --region $REGION to be sure which ones are available to you.
<sup>2</sup>The US GovCloud regions are only available to official U.S. government agencies and organizations.
<sup>3</sup>The China regions are only available to AWS in China accounts.
Libraries 
Raw Data
You can download a JSON file with all the region data here.
Development
Run ./regions.sh to auto-generate data files for each SDK when the data in regions.json changes.