diff --git a/django/contrib/localflavor/us/us_states.py b/django/contrib/localflavor/us/us_states.py
index f1a3d73aaf..0da47d57b7 100644
--- a/django/contrib/localflavor/us/us_states.py
+++ b/django/contrib/localflavor/us/us_states.py
@@ -152,10 +152,10 @@ OBSOLETE_STATES = (
 
 
 # All US states and territories plus DC and military mail.
-STATE_CHOICES = sorted(US_STATES + US_TERRITORIES + ARMED_FORCES_STATES, key=lambda obj: obj[1])
+STATE_CHOICES = tuple(sorted(US_STATES + US_TERRITORIES + ARMED_FORCES_STATES, key=lambda obj: obj[1]))
 
 # All US Postal Service locations.
-USPS_CHOICES = sorted(US_STATES + US_TERRITORIES + ARMED_FORCES_STATES + COFA_STATES, key=lambda obj: obj[1])
+USPS_CHOICES = tuple(sorted(US_STATES + US_TERRITORIES + ARMED_FORCES_STATES + COFA_STATES, key=lambda obj: obj[1]))
 
 STATES_NORMALIZED = {
     'ak': 'AK',