diff --git a/server/routers/dry-wash/model/order.js b/server/routers/dry-wash/model/order.js
index 6fdaa25..8ee924f 100644
--- a/server/routers/dry-wash/model/order.js
+++ b/server/routers/dry-wash/model/order.js
@@ -27,6 +27,11 @@ const schema = new Schema({
         type: String,
         required: true
     },
+    orderNumber: {
+        type: String,
+        required: true,
+        unique: true
+    },
     status: {
         type: String,
         required: true,
diff --git a/server/routers/dry-wash/order.js b/server/routers/dry-wash/order.js
index d258fa0..6cdb11f 100644
--- a/server/routers/dry-wash/order.js
+++ b/server/routers/dry-wash/order.js
@@ -74,6 +74,21 @@ const VALIDATION_MESSAGES = {
     },
 }
 
+/**
+ * Generates the next order number incrementing the last order number
+ * @returns {Promise<string>}
+ */
+const generateOrderNumber = async () => {
+    const lastOrder = await OrderModel.findOne().sort({ created: -1 })
+    if (lastOrder) {
+        const lastOrderNumber = parseInt(lastOrder.orderNumber ?? '0')
+        const nextOrderNumber = lastOrderNumber + 1
+        return String(nextOrderNumber)
+    }
+    
+    return '1' // number of the very first order
+}
+
 router.post('/create', async (req, res, next) => {
     const bodyErrors = []
 
@@ -129,6 +144,7 @@ router.post('/create', async (req, res, next) => {
             startWashTime: washing.begin,
             endWashTime: washing.end,
             location: washing.location,
+            orderNumber: await generateOrderNumber(),
             status: orderStatus.PROGRESS,
             notes: '',
             created: new Date().toISOString(),