diff --git a/usps/address.py b/usps/address.py
index 7c84508..2f474b6 100644
--- a/usps/address.py
+++ b/usps/address.py
@@ -1,7 +1,9 @@
 from lxml import etree
+from urllib.parse import quote
 
 
 class Address(object):
+    QUOTE_SAFE_CHARS = " /"
 
     def __init__(self, name, address_1, city, state, zipcode,
                  zipcode_ext='', company='', address_2='', phone=''):
@@ -15,32 +17,35 @@ def __init__(self, name, address_1, city, state, zipcode,
         self.zipcode_ext = zipcode_ext
         self.phone = phone
 
+    def _escape(self, string):
+        return quote(string, self.QUOTE_SAFE_CHARS)
+
     def add_to_xml(self, root, prefix='To', validate=False):
         if not validate:
             name = etree.SubElement(root, prefix + 'Name')
-            name.text = self.name
+            name.text = self._escape(self.name)
 
         company = etree.SubElement(root, prefix + 'Firm' + ('Name' if validate else ''))
-        company.text = self.company
+        company.text = self._escape(self.company)
     
         address_1 = etree.SubElement(root, prefix + 'Address1')
-        address_1.text = self.address_1
+        address_1.text = self._escape(self.address_1)
 
         address_2 = etree.SubElement(root, prefix + 'Address2')
-        address_2.text = self.address_2 or '-'
+        address_2.text = self._escape(self.address_2) or '-'
     
         city = etree.SubElement(root, prefix + 'City')
-        city.text = self.city
+        city.text = self._escape(self.city)
 
         state = etree.SubElement(root, prefix + 'State')
-        state.text = self.state
+        state.text = self._escape(self.state)
 
         zipcode = etree.SubElement(root, prefix + 'Zip5')
-        zipcode.text = self.zipcode
+        zipcode.text = self._escape(self.zipcode)
 
         zipcode_ext = etree.SubElement(root, prefix + 'Zip4')
-        zipcode_ext.text = self.zipcode_ext
+        zipcode_ext.text = self._escape(self.zipcode_ext)
 
         if not validate:
             phone = etree.SubElement(root, prefix + 'Phone')
-            phone.text = self.phone
+            phone.text = self._escape(self.phone)