diff --git a/pems/districts/urls.py b/pems/districts/urls.py
index a56d963..979bf94 100644
--- a/pems/districts/urls.py
+++ b/pems/districts/urls.py
@@ -2,7 +2,7 @@
 URLConf for the districts app.
 """
 
-from django.urls import path
+from django.urls import path, re_path
 
 from pems.districts import views
 
@@ -10,5 +10,5 @@
 urlpatterns = [
     # /districts
     path("", views.IndexView.as_view(), name="index"),
-    path("<int:district_number>", views.DistrictView.as_view(), name="district"),
+    re_path(r"^(?P<district_number>([1-9]|1[0-2]))$", views.DistrictView.as_view(), name="district"),
 ]
diff --git a/pems/settings.py b/pems/settings.py
index 329d965..4d776a4 100644
--- a/pems/settings.py
+++ b/pems/settings.py
@@ -52,7 +52,7 @@ def _filter_empty(ls):
 TEMPLATES = [
     {
         "BACKEND": "django.template.backends.django.DjangoTemplates",
-        "DIRS": [],
+        "DIRS": [os.path.join(BASE_DIR, "pems", "templates")],
         "APP_DIRS": True,
         "OPTIONS": {
             "context_processors": [
diff --git a/pems/templates/404.html b/pems/templates/404.html
new file mode 100644
index 0000000..c0944fd
--- /dev/null
+++ b/pems/templates/404.html
@@ -0,0 +1,7 @@
+{% extends "core/base.html" %}
+{% block headline %}
+    Sorry! We can’t find that page.
+{% endblock headline %}
+{% block inner-content %}
+    <p>The page you are looking for might be somewhere else or may not exist anymore.</p>
+{% endblock inner-content %}