diff --git a/sanitizer/_synthesize_analysis.js b/sanitizer/_synthesize_analysis.js
index f26dfc6a..6c702f9e 100644
--- a/sanitizer/_synthesize_analysis.js
+++ b/sanitizer/_synthesize_analysis.js
@@ -50,10 +50,7 @@ function sanitize( raw, clean ){
 
   }, {});
 
-  if (isPostalCodeOnly(clean.parsed_text)) {
-    messages.errors.push('postalcode-only inputs are not supported');
-  }
-  else if (_.isEmpty(Object.keys(clean.parsed_text))) {
+  if (_.isEmpty(Object.keys(clean.parsed_text))) {
     messages.errors.push(
       `at least one of the following fields is required: ${Object.keys(fields).join(', ')}`);
   }
diff --git a/test/unit/fixture/structured_geocoding/fallback.json b/test/unit/fixture/structured_geocoding/fallback.json
index cd12a864..58d0ce8c 100644
--- a/test/unit/fixture/structured_geocoding/fallback.json
+++ b/test/unit/fixture/structured_geocoding/fallback.json
@@ -287,6 +287,75 @@
                     "boost": 5
                   }
                 },
+                {
+                  "bool": {
+                    "_name": "fallback.postalcode",
+                    "must": [
+                      {
+                        "multi_match": {
+                          "query": "postalcode value",
+                          "type": "phrase",
+                          "fields": [
+                            "parent.postalcode"
+                          ]
+                        }
+                      },
+                      {
+                        "multi_match": {
+                          "query": "city value",
+                          "type": "phrase",
+                          "fields": [
+                            "parent.locality",
+                            "parent.locality_a",
+                            "parent.localadmin",
+                            "parent.localadmin_a"
+                          ]
+                        }
+                      },
+                      {
+                        "multi_match": {
+                          "query": "county value",
+                          "type": "phrase",
+                          "fields": [
+                            "parent.county",
+                            "parent.county_a",
+                            "parent.macrocounty",
+                            "parent.macrocounty_a"
+                          ]
+                        }
+                      },
+                      {
+                        "multi_match": {
+                          "query": "state value",
+                          "type": "phrase",
+                          "fields": [
+                            "parent.region",
+                            "parent.region_a",
+                            "parent.macroregion",
+                            "parent.macroregion_a"
+                          ]
+                        }
+                      },
+                      {
+                        "multi_match": {
+                          "query": "country value",
+                          "type": "phrase",
+                          "fields": [
+                            "parent.country",
+                            "parent.country_a",
+                            "parent.dependency",
+                            "parent.dependency_a"
+                          ]
+                        }
+                      }
+                    ],
+                    "filter": {
+                      "term": {
+                        "layer": "postalcode"
+                      }
+                    }
+                  }
+                },
                 {
                   "bool": {
                     "_name": "fallback.neighbourhood",
diff --git a/test/unit/fixture/structured_geocoding/postalcode_only.js b/test/unit/fixture/structured_geocoding/postalcode_only.js
new file mode 100644
index 00000000..7dafbaa0
--- /dev/null
+++ b/test/unit/fixture/structured_geocoding/postalcode_only.js
@@ -0,0 +1,68 @@
+module.exports = {
+  'query': {
+    'function_score': {
+      'query': {
+        'filtered': {
+          'query': {
+            'bool': {
+              'should': [
+                {
+                  'bool': {
+                    '_name': 'fallback.postalcode',
+                    'must': [
+                      {
+                        'multi_match': {
+                          'query': 'postalcode value',
+                          'type': 'phrase',
+                          'fields': [
+                            'parent.postalcode'
+                          ]
+                        }
+                      }
+                    ],
+                    'filter': {
+                      'term': {
+                        'layer': 'postalcode'
+                      }
+                    }
+                  }
+                }
+              ]
+            }
+          },
+          'filter': {
+            'bool': {
+              'must': []
+            }
+          }
+        }
+      },
+      'max_boost': 20,
+      'functions': [
+        {
+          'field_value_factor': {
+            'modifier': 'log1p',
+            'field': 'popularity',
+            'missing': 1
+          },
+          'weight': 1
+        },
+        {
+          'field_value_factor': {
+            'modifier': 'log1p',
+            'field': 'population',
+            'missing': 1
+          },
+          'weight': 2
+        }
+      ],
+      'score_mode': 'avg',
+      'boost_mode': 'multiply'
+    }
+  },
+  'size': 20,
+  'track_scores': true,
+  'sort': [
+    '_score'
+  ]
+};
diff --git a/test/unit/query/structured_geocoding.js b/test/unit/query/structured_geocoding.js
index fc5f211a..d93a03aa 100644
--- a/test/unit/query/structured_geocoding.js
+++ b/test/unit/query/structured_geocoding.js
@@ -188,6 +188,24 @@ module.exports.tests.query = function(test, common) {
 
   });
 
+  test('parsed_text with all fields should use FallbackQuery', function(t) {
+    var clean = {
+      parsed_text: {
+        postalcode: 'postalcode value'
+      }
+    };
+
+    var query = generate(clean);
+
+    var compiled = JSON.parse(JSON.stringify(query));
+    var expected = require('../fixture/structured_geocoding/postalcode_only');
+
+    t.deepEqual(compiled.type, 'fallback', 'query type set');
+    t.deepEqual(compiled.body, expected, 'structured postalcode only');
+    t.end();
+
+  });
+
   test('valid boundary.country search', function(t) {
     var clean = {
       parsed_text: {
diff --git a/test/unit/sanitizer/_synthesize_analysis.js b/test/unit/sanitizer/_synthesize_analysis.js
index 97d49b2a..82352c8d 100644
--- a/test/unit/sanitizer/_synthesize_analysis.js
+++ b/test/unit/sanitizer/_synthesize_analysis.js
@@ -131,7 +131,7 @@ module.exports.tests.text_parser = function(test, common) {
     const messages = sanitizer(raw, clean);
 
     t.deepEquals(clean, expected_clean);
-    t.deepEquals(messages.errors, ['postalcode-only inputs are not supported'], 'no errors');
+    t.deepEquals(messages.errors, [], 'no errors');
     t.deepEquals(messages.warnings, [], 'no warnings');
     t.end();