diff --git a/google/cloud/bigquery/_helpers.py b/google/cloud/bigquery/_helpers.py
index 68c6ea473911..181734f5b75e 100644
--- a/google/cloud/bigquery/_helpers.py
+++ b/google/cloud/bigquery/_helpers.py
@@ -75,7 +75,9 @@ def _string_from_json(value, _):
 
 _CELLDATA_FROM_JSON = {
     'INTEGER': _int_from_json,
+    'INT64': _int_from_json,
     'FLOAT': _float_from_json,
+    'FLOAT64': _float_from_json,
     'BOOLEAN': _bool_from_json,
     'TIMESTAMP': _datetime_from_json,
     'DATE': _date_from_json,
diff --git a/unit_tests/bigquery/test__helpers.py b/unit_tests/bigquery/test__helpers.py
index bdf766ad2778..72a95e5f0dcc 100644
--- a/unit_tests/bigquery/test__helpers.py
+++ b/unit_tests/bigquery/test__helpers.py
@@ -284,6 +284,37 @@ def test_w_record_subfield(self):
         coerced = self._callFUT(rows, schema)
         self.assertEqual(coerced, expected)
 
+    def test_w_int64_float64(self):
+        # "Standard" SQL dialect uses 'INT64', 'FLOAT64'.
+        candidate = _Field('REQUIRED', 'candidate', 'STRING')
+        votes = _Field('REQUIRED', 'votes', 'INT64')
+        percentage = _Field('REQUIRED', 'percentage', 'FLOAT64')
+        schema = [candidate, votes, percentage]
+        rows = [
+            {'f': [
+                {'v': 'Phred Phlyntstone'},
+                {'v': 8},
+                {'v': 0.25},
+            ]},
+            {'f': [
+                {'v': 'Bharney Rhubble'},
+                {'v': 4},
+                {'v': 0.125},
+            ]},
+            {'f': [
+                {'v': 'Wylma Phlyntstone'},
+                {'v': 20},
+                {'v': 0.625},
+            ]},
+        ]
+        expected = [
+            ('Phred Phlyntstone', 8, 0.25),
+            ('Bharney Rhubble', 4, 0.125),
+            ('Wylma Phlyntstone', 20, 0.625),
+        ]
+        coerced = self._callFUT(rows, schema)
+        self.assertEqual(coerced, expected)
+
 
 class Test_ConfigurationProperty(unittest.TestCase):