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diff --git a/stdnum/at/postleitzahl.py b/stdnum/at/postleitzahl.py
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+# postleitzahl.py - functions for handling Austrian postal codes
+#
+# Copyright (C) 2018 Arthur de Jong
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+"""Postleitzahl (Austrian postal code).
+
+The Austrian postal code consists of four digits that identifies a post
+office in Austria.
+
+More information:
+
+* https://en.wikipedia.org/wiki/Postal_codes_in_Austria
+* https://www.post.at/suche/standortsuche.php/index/selectedsearch/plz
+
+>>> validate('5090')
+'5090'
+>>> import json
+>>> print(json.dumps(info('5090'), indent=2, sort_keys=True))
+{
+  "location": "Lofer",
+  "region": "Salzburg"
+}
+>>> validate('4231')  # not-existing postal code
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+>>> validate('ABCD')
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+"""
+
+from stdnum.exceptions import *
+from stdnum.util import clean
+
+
+def compact(number):
+    """Convert the number to the minimal representation. This strips the
+    number of any valid separators and removes surrounding whitespace."""
+    return clean(number).strip()
+
+
+def info(number):
+    """Return a dictionary of data about the supplied number. This typically
+    returns the location."""
+    number = compact(number)
+    from stdnum import numdb
+    return numdb.get('at/postleitzahl').info(number)[0][1]
+
+
+def validate(number):
+    """Check if the number is a valid postal code."""
+    number = compact(number)
+    if not number.isdigit():
+        raise InvalidFormat()
+    if len(number) != 4:
+        raise InvalidLength()
+    if not info(number):
+        raise InvalidComponent()
+    return number
+
+
+def is_valid(number):
+    """Check if the number is a valid postal code."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False