diff --git a/conservancy_beancount/data.py b/conservancy_beancount/data.py
index 829cec77ac9f898d0ad0702f9a083accc52dadd2..b102f3bc01f034c18b4ffb05ccdd451d8540b2f6 100644
--- a/conservancy_beancount/data.py
+++ b/conservancy_beancount/data.py
@@ -220,16 +220,19 @@ class Account(str):
                 yield account
 
     @classmethod
-    def iter_accounts(cls, s: str) -> Iterator['Account']:
+    def iter_accounts(cls, s: Optional[str]=None) -> Iterator['Account']:
         """Iterate account objects by name or classification
 
+        With no argument, returns an iterator of all known account names.
         If you pass in a root account name, or a valid account string, returns
         an iterator of all accounts under that account in the hierarchy.
         Otherwise, returns an iterator of all accounts with the given
         ``classification`` metadata.
         """
+        if s is None:
+            return (cls(acct) for acct in cls._meta_map)
         # We append a stub subaccount to match root accounts.
-        if cls.is_account(f'{s}:Test'):
+        elif cls.is_account(f'{s}:RootsOK'):
             return cls.iter_accounts_by_hierarchy(s)
         else:
             return cls.iter_accounts_by_classification(s)