diff --git a/c3l_membership/forms.py b/c3l_membership/forms.py
--- a/c3l_membership/forms.py
+++ b/c3l_membership/forms.py
@@ -124,7 +124,7 @@ class MembershipForm(FlaskForm):
         validators=[Optional(), Length(max=4000)],
     )
 
-    zip = StringField(
+    postal = StringField(
         lazy_gettext("Postal Code"),
         validators=[Optional(), Length(max=30)],
     )
diff --git a/c3l_membership/templates/index.html b/c3l_membership/templates/index.html
--- a/c3l_membership/templates/index.html
+++ b/c3l_membership/templates/index.html
@@ -141,8 +141,8 @@
                 </div>
                 <div class="pure-g">
                   <div class="pure-u-1-1">
-                    <b>{{ form.zip.label }}</b>
-                    {{ form.zip(class="pure-input-1 field-error" if form.zip.errors else "pure-input-1") }}
+                    <b>{{ form.postal.label }}</b>
+                    {{ form.postal(class="pure-input-1 field-error" if form.postal.errors else "pure-input-1") }}
                   </div>
                 </div>
                 <div class="pure-g">
diff --git a/c3l_membership/templates/member.html b/c3l_membership/templates/member.html
--- a/c3l_membership/templates/member.html
+++ b/c3l_membership/templates/member.html
@@ -36,8 +36,8 @@
         <div>{{ form.street.data if form.street.data else "".join(["<i>",_("Not specified"),"</i>"])|safe }}</div>
       </div>
       <div>
-        <div>{% trans %}ZIP-Code:{% endtrans %}</div>
-        <div>{{ form.zip.data if form.zip.data else "".join(["<i>",_("Not specified"),"</i>"])|safe }}</div>
+        <div>{% trans %}Postal Code:{% endtrans %}</div>
+        <div>{{ form.postal.data if form.postal.data else "".join(["<i>",_("Not specified"),"</i>"])|safe }}</div>
       </div>
       <div>
         <div>{% trans %}City:{% endtrans %}</div>
diff --git a/c3l_membership/views.py b/c3l_membership/views.py
--- a/c3l_membership/views.py
+++ b/c3l_membership/views.py
@@ -109,7 +109,7 @@ def index():
                 " ".join(
                     (
                         form.street.data,
-                        form.zip.data,
+                        form.postal.data,
                         form.city.data,
                         form.state.data,
                         form.country.data,