Customers can find the AWS account ID using either the AWS Management Console or the AWS Command Line Interface (AWS CLI). In the console, the location of the account ID depends on whether you’re signed in as the root user or an IAM user. The account ID is the same whether you’re signed in as the root user or an IAM user.
Finding your account ID as the root user
AWS Management Console:
To find your AWS account ID when signed in as the root user
In the navigation bar on the upper right, choose your account name or number and then choose Security credentials.
Under the Account details section, the account number appears next to AWS account ID.
Find your account ID as an IAM user
AWS Management Console:
To find your AWS account ID when signed in as an IAM user
Minimum permissions
To perform the following steps, you must have at least the following IAM permissions:
account:GetAccountInformation
In the navigation bar on the upper right, choose your user name and then choose Security credentials.
At the top of the page, under Account details, the account number appears next to AWS account IDNote: If you don’t see the Security credentials option, you might be signed in as a federated user with an IAM role, instead of as an IAM user. In this case, look for the entry Account and the account ID number next to it.
Please see the following link for more details – Find your AWS account ID
