diff --git a/serializer/RegionalChapter.yaml b/serializer/RegionalChapter.yaml
index a00b34e..35fa34a 100644
--- a/serializer/RegionalChapter.yaml
+++ b/serializer/RegionalChapter.yaml
@@ -6,5 +6,7 @@ Netzbegruenung\Api\Model\RegionalChapter:
       type: string
     type:
       type: string
+    zipCode:
+      type: string
     organization:
       type: Netzbegruenung\Api\Model\Organization
diff --git a/src/RegionalChapter.php b/src/RegionalChapter.php
index 811c178..d3a12de 100644
--- a/src/RegionalChapter.php
+++ b/src/RegionalChapter.php
@@ -24,6 +24,11 @@ class RegionalChapter
      */
     protected $organization;
 
+    /**
+     * @var string|null
+     */
+    protected $zipCode;
+
     /**
      * @return string
      */
@@ -87,4 +92,20 @@ class RegionalChapter
     {
         $this->organization = $organization;
     }
+
+    /**
+     * @return string|null
+     */
+    public function getZipCode() : ?string
+    {
+        return $this->zipCode;
+    }
+
+    /**
+     * @param string|null $zipCode
+     */
+    public function setZipCode(?string $zipCode): void
+    {
+        $this->zipCode = $zipCode;
+    }
 }