diff --git a/tests/lookup.js b/tests/lookup.js
index 46a68db..ecdaf44 100644
--- a/tests/lookup.js
+++ b/tests/lookup.js
@@ -19,6 +19,9 @@ var test_zipcodes = {
     '94110': 'America/Los_Angeles',
     '06419': 'America/New_York',
     '93460': 'America/Los_Angeles',
+    '84129': 'America/Denver',
+    '60418': 'America/Chicago',
+    '72713': 'America/Chicago',
     '00000': null
 };
 
diff --git a/zipcodes.json b/zipcodes.json
index 8670120..dd4322b 100644
--- a/zipcodes.json
+++ b/zipcodes.json
@@ -22958,6 +22958,7 @@
     "60415": 1,
     "60416": 1,
     "60417": 1,
+    "60418": 1,
     "60419": 1,
     "60420": 1,
     "60421": 1,
@@ -28202,6 +28203,7 @@
     "72711": 1,
     "72712": 1,
     "72714": 1,
+    "72713": 1,
     "72715": 1,
     "72716": 1,
     "72717": 1,
@@ -33026,6 +33028,7 @@
     "84126": 2,
     "84127": 2,
     "84128": 2,
+    "84129": 2,
     "84130": 2,
     "84131": 2,
     "84132": 2,