Welcome to COSTARS Login!

If you have not accessed your COSTARS Membership account since July 9, 2013, you must complete the user registration process to get a new User ID and Password. Prior login credentials issued by COSTARS will not work in our new system.

The new COSTARS System uses a shared login portal with other Commonwealth systems. If you have a User ID and Password that has been used to access other Commonwealth systems via the Pennsylvania Login service, you may try using those same credentials to access the COSTARS System.
To access your COSTARS membership profile or register your organization as a new member, you must first register individually. If necessary, click here to start your user registration process.

If you are already registered, please login below:
User ID:

If you forgot your UserID or Password, click here to get your UserID and temporary password.
This login is for COSTARS members only. If you are a supplier, click here to sign-in.