diff --git a/l10n_us_partner_zipcode/__init__.py b/l10n_us_partner_zipcode/__init__.py
new file mode 100644
index 00000000..91fed54d
--- /dev/null
+++ b/l10n_us_partner_zipcode/__init__.py
@@ -0,0 +1 @@
+from . import res_partner
diff --git a/l10n_us_partner_zipcode/__manifest__.py b/l10n_us_partner_zipcode/__manifest__.py
new file mode 100644
index 00000000..584eac06
--- /dev/null
+++ b/l10n_us_partner_zipcode/__manifest__.py
@@ -0,0 +1,37 @@
+{
+    'name': 'US ZIP Code to City/State',
+    'summary': 'Determines the City and State from a provided ZIP code.',
+    'version': '12.0.1.0.0',
+    'author': "Hibou Corp.",
+    'category': 'Localization',
+    'license': 'AGPL-3',
+    'complexity': 'easy',
+    'images': [],
+    'website': "https://hibou.io",
+    'description': """
+US ZIP Code to City/State
+=========================
+
+Determines the City and State from a provided ZIP code. Requires the `uszipcode` python package.
+
+Does not require `base_geolocalize`, but will fill the related fields if possible.
+
+
+Contributors
+------------
+
+* Jared Kipe <jared@hibou.io>
+
+""",
+    'depends': [
+        'base',
+    ],
+    'external_dependencies': {
+        'python': ['uszipcode']
+    },
+    'demo': [],
+    'data': [
+    ],
+    'auto_install': False,
+    'installable': True,
+}
diff --git a/l10n_us_partner_zipcode/res_partner.py b/l10n_us_partner_zipcode/res_partner.py
new file mode 100644
index 00000000..f209168a
--- /dev/null
+++ b/l10n_us_partner_zipcode/res_partner.py
@@ -0,0 +1,39 @@
+import logging
+
+_logger = logging.getLogger(__name__)
+
+try:
+    from uszipcode import SearchEngine
+except ImportError:
+    _logger.warn('module "uszipcode" cannot be loaded, you will be unable to detect Cities and States by ZIP')
+    SearchEngine = None
+
+from odoo import api, fields, models
+
+
+class Partner(models.Model):
+    _inherit = 'res.partner'
+
+    @api.onchange('zip')
+    def _zip_to_city_state(self):
+        if SearchEngine and self.zip and not self.city:
+            country_us = self.env['res.country'].search([('code', '=', 'US')], limit=1)
+            state_obj = self.env['res.country.state']
+            if not self.country_id or self.country_id.id == country_us.id:
+                with SearchEngine() as search:
+                    zipcode = search.by_zipcode(self.zip)
+                    if zipcode:
+                        if not self.country_id:
+                            self.country_id = country_us
+
+                        self.city = zipcode.city
+                        self.state_id = state_obj.search([
+                            ('code', '=', zipcode.state),
+                            ('country_id', '=', country_us.id),
+                        ], limit=1)
+
+                        if hasattr(self, 'partner_latitude') and not self.partner_latitude:
+                            self.partner_latitude = zipcode.lat
+                            self.partner_longitude = zipcode.lng
+                            self.date_localization = fields.Date.context_today(self)
+        return {}