diff --git a/ui/input_menu.py b/ui/input_menu.py
index 257d7d6..1d39ef7 100644
--- a/ui/input_menu.py
+++ b/ui/input_menu.py
@@ -34,6 +34,11 @@ class Validator:
         regex = re.compile(r'^(?=.*[A-Za-z])(?=.*\d)(?=.*[@$!%*#?&])[A-Za-z\d@$!%*#?&]{8,31}$')
         return re.fullmatch(regex, input)
 
+    @staticmethod
+    def check_postcode(input):
+        regex = re.compile(r'\b\d{4}[A-Z]{2}\b')
+        return re.fullmatch(regex, input)
+
 class InputMenu:
 
     def __init__(self, title):
diff --git a/views/advisor_menu.py b/views/advisor_menu.py
index f5f2587..6fc0e6d 100644
--- a/views/advisor_menu.py
+++ b/views/advisor_menu.py
@@ -62,7 +62,7 @@ class AdvisorMenu:
         form.add_option("FIRSTNAME", "Firstname", "STR", None, 1, 250, None)
         form.add_option("LASTNAME", "Lastname", "STR", None, 1, 250, None)
         form.add_option("ADDRESS", "Address", "STR", None, 1, 250, None)
-        form.add_option("ZIPCODE", "Zipcode", "STR", None, 6, 6, None)
+        form.add_option("ZIPCODE", "Zipcode", "STR", None, 6, 6, Validator.check_postcode)
         form.add_option("EMAIL", "Email", "STR", None, 1, 250, Validator.check_email)
         form.add_option("PHONE", "Phone (+31-6)", "STR", None, 8, 8, None)
         form.add_option("PASSWORD", "Password", "STR", None, 1, 255, Validator.check_password)
@@ -97,7 +97,7 @@ class AdvisorMenu:
         edit_form.add_option("FIRSTNAME", "Firstname", "STR", user.firstname, 1, 250, None)
         edit_form.add_option("LASTNAME", "Lastname", "STR", user.lastname, 1, 250, None)
         edit_form.add_option("ADDRESS", "Address", "STR", user.address, 1, 250, None)
-        edit_form.add_option("ZIPCODE", "Zipcode", "STR", user.zipcode, 6, 6, None)
+        edit_form.add_option("ZIPCODE", "Zipcode", "STR", user.zipcode, 6, 6, Validator.check_postcode)
         edit_form.add_option("EMAIL", "Email", "STR", user.email, 1, 250, Validator.check_email)
         edit_form.add_option("PHONE", "Phone (+31-6)", "STR", user.phone, 8, 8, None)
         edit_form.do_input()
diff --git a/views/member_menu.py b/views/member_menu.py
index bb5cb93..06112e9 100644
--- a/views/member_menu.py
+++ b/views/member_menu.py
@@ -62,7 +62,7 @@ class MemberMenu:
         form.add_option("FIRSTNAME", "Firstname", "STR", None, 1, 250, None)
         form.add_option("LASTNAME", "Lastname", "STR", None, 1, 250, None)
         form.add_option("ADDRESS", "Address", "STR", None, 1, 250, None)
-        form.add_option("ZIPCODE", "Zipcode", "STR", None, 6, 6, None)
+        form.add_option("ZIPCODE", "Zipcode", "STR", None, 6, 6, Validator.check_postcode)
         form.add_option("EMAIL", "Email", "STR", None, 1, 250, Validator.check_email)
         form.add_option("PHONE", "Phone (+31-6)", "STR", None, 8, 8, None)
         form.do_input()
@@ -95,7 +95,7 @@ class MemberMenu:
         edit_form.add_option("FIRSTNAME", "Firstname", "STR", user.firstname, 1, 250, None)
         edit_form.add_option("LASTNAME", "Lastname", "STR", user.lastname, 1, 250, None)
         edit_form.add_option("ADDRESS", "Address", "STR", user.address, 1, 250, None)
-        edit_form.add_option("ZIPCODE", "Zipcode", "STR", user.zipcode, 6, 6, None)
+        edit_form.add_option("ZIPCODE", "Zipcode", "STR", user.zipcode, 6, 6, Validator.check_postcode)
         edit_form.add_option("EMAIL", "Email", "STR", user.email, 1, 250, Validator.check_email)
         edit_form.add_option("PHONE", "Phone (+31-6)", "STR", user.phone, 8, 8, None)
         edit_form.do_input()
diff --git a/views/system_admin_menu.py b/views/system_admin_menu.py
index 9f2f4b0..c67f72e 100644
--- a/views/system_admin_menu.py
+++ b/views/system_admin_menu.py
@@ -62,7 +62,7 @@ class SystemAdminMenu:
         form.add_option("FIRSTNAME", "Firstname", "STR", None, 1, 250, None)
         form.add_option("LASTNAME", "Lastname", "STR", None, 1, 250, None)
         form.add_option("ADDRESS", "Address", "STR", None, 1, 250, None)
-        form.add_option("ZIPCODE", "Zipcode", "STR", None, 6, 6, None)
+        form.add_option("ZIPCODE", "Zipcode", "STR", None, 6, 6, Validator.check_postcode)
         form.add_option("EMAIL", "Email", "STR", None, 1, 250, Validator.check_email)
         form.add_option("PHONE", "Phone (+31-6)", "STR", None, 8, 8, None)
         form.add_option("PASSWORD", "Password", "STR", None, 1, 255, Validator.check_password)
@@ -100,8 +100,7 @@ class SystemAdminMenu:
         edit_form.add_option("FIRSTNAME", "Firstname", "STR", user.firstname, 1, 250, None)
         edit_form.add_option("LASTNAME", "Lastname", "STR", user.lastname, 1, 250, None)
         edit_form.add_option("ADDRESS", "Address", "STR", user.address, 1, 250, None)
-        edit_form.add_option("ZIPCODE", "Zipcode", "STR", user.zipcode, 6, 6, None)
-        edit_form.add_option("CITY_ID", "City", "STR", user.city_id, 1, 250, None)
+        edit_form.add_option("ZIPCODE", "Zipcode", "STR", user.zipcode, 6, 6, Validator.check_postcode)
         edit_form.add_option("EMAIL", "Email", "STR", user.email, 1, 250, Validator.check_email)
         edit_form.add_option("PHONE", "Phone (+31-6)", "STR", user.phone, 8, 8, None)
         edit_form.do_input()