diff --git a/src/definitions/location.ts b/src/definitions/location.ts
index 079bc22ed71..f8e277885be 100644
--- a/src/definitions/location.ts
+++ b/src/definitions/location.ts
@@ -12,6 +12,8 @@ export type LocationDefinition = LocaleEntry<{
     [state: string]: string | string[];
   };
 
+  postcode_prefix: string[];
+
   /**
    * Postcodes patterns.
    */
diff --git a/src/locales/cy/location/index.ts b/src/locales/cy/location/index.ts
index ca01acd6427..3d5c0b4a89e 100644
--- a/src/locales/cy/location/index.ts
+++ b/src/locales/cy/location/index.ts
@@ -6,11 +6,15 @@ import type { LocationDefinition } from '../../..';
 import county from './county';
 import direction from './direction';
 import postal_address from './postal_address';
+import postcode from './postcode';
+import postcode_prefix from './postcode_prefix';
 
 const location: LocationDefinition = {
   county,
   direction,
   postal_address,
+  postcode,
+  postcode_prefix,
 };
 
 export default location;
diff --git a/src/locales/cy/location/postcode.ts b/src/locales/cy/location/postcode.ts
new file mode 100644
index 00000000000..f242f69e8be
--- /dev/null
+++ b/src/locales/cy/location/postcode.ts
@@ -0,0 +1,4 @@
+export default [
+  '{{location.postcode_prefix}}# #??',
+  '{{location.postcode_prefix}}## #??',
+];
diff --git a/src/locales/cy/location/postcode_prefix.ts b/src/locales/cy/location/postcode_prefix.ts
new file mode 100644
index 00000000000..9e84f0ca9e9
--- /dev/null
+++ b/src/locales/cy/location/postcode_prefix.ts
@@ -0,0 +1 @@
+export default ['CF', 'CH', 'HR', 'LD', 'LL', 'NP', 'SA', 'SY'];
diff --git a/src/modules/location/index.ts b/src/modules/location/index.ts
index 98bd7879c6c..b8562330b01 100644
--- a/src/modules/location/index.ts
+++ b/src/modules/location/index.ts
@@ -269,6 +269,9 @@ export class LocationModule extends SimpleLocationModule {
     }
 
     let { format = this.faker.definitions.location.postcode } = options;
+
+    format = this.faker.helpers.fake(this.faker.definitions.location.postcode);
+
     if (typeof format === 'string') {
       format = [format];
     }
diff --git a/test/__snapshots__/locale-data.spec.ts.snap b/test/__snapshots__/locale-data.spec.ts.snap
index 217a06fde79..9859a956911 100644
--- a/test/__snapshots__/locale-data.spec.ts.snap
+++ b/test/__snapshots__/locale-data.spec.ts.snap
@@ -8,7 +8,7 @@ exports[`locale-data > should only have known characters 1`] = `
   "base": " ()+,-./:;ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz",
   "bn_BD": " (),-ঁংঅআইঈউএওকখগঘঙচছজঝঞটঠডঢণতথদধনপফবভমযরলশষসহ়ািীুূৃেৈোৌ্ড়য়",
   "cs_CZ": " #()+-.ABCDEFGHIJKLMNOPRSTUVWXZabcdefghijklmnopqrstuvwxyzÁÍÚáéíóöúüýČčĎďěňŘřŠšťůűŽž",
-  "cy": " ,-ABCDEFGHILMNOPRSTWYabcdefghijklmnoprstuwyôŵ",
+  "cy": " #,-?ABCDEFGHILMNOPRSTWYabcdefghijklmnoprstuwyôŵ",
   "da": " !"#()+,-./ABCDEFGHIJKLMNOPQRSTUVWYZabcdefghijklmnopqrstuvwxyzÅÆØãåæçéíø",
   "de": " #&'()+,-.ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzÄÖÜßàãäéíöúü",
   "de_AT": " #&()+,-.ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzÄÖÜßãäéíöúü",