Starting today, you can use AWS Resource Groups and Tag Editor in the AWS GovCloud (US) Regions. AWS Resource Groups makes it easier to manage and automate tasks on large numbers of AWS resources. AWS Resource Groups Tag Editor allows you to add tags to, edit, or delete tags on multiple AWS resources at once. AWS Resource Groups supports over 140 resource types, and AWS Resource Groups Tag Editor supports over 50 AWS resource types. To learn more about AWS Resource Groups, visit our documentation.
from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/10/aws-resource-groups-and-tag-editor-are-now-available-in-the-aws-govcloud-us-regions/