diff --git a/QualtricsAPI/XM/mailinglists.py b/QualtricsAPI/XM/mailinglists.py
index 95c8440..65c5bf9 100644
--- a/QualtricsAPI/XM/mailinglists.py
+++ b/QualtricsAPI/XM/mailinglists.py
@@ -47,7 +47,7 @@ def list_lists(self, page_size=100):
 
         mailing_lists = pd.DataFrame()
         headers, base_url = self.header_setup(xm=True)
-        url = base_url + f"/mailinglists/?pageSize={page_size}"
+        url = base_url + f"/mailinglists/?pageSize={page_size}&includeCount=true"
         try:
           def get_page(mailing_lists=mailing_lists, url=url):
             ''' This method is a nested method that extracts a single page of mailing lists. '''
@@ -264,4 +264,4 @@ def create_contact_in_list(self, mailing_list=None, **kwargs):
             print(f"ServerError: {response['meta']['httpStatus']}\nError Code: {response['meta']['error']['errorCode']}\nError Message: {response['meta']['error']['errorMessage']}")
         else:
             contact_list_id = response['result']['contactLookupId']
-            return contact_id, contact_list_id
\ No newline at end of file
+            return contact_id, contact_list_id