diff --git a/README.md b/README.md
index a3fb7debd..d24b80f82 100644
--- a/README.md
+++ b/README.md
@@ -157,7 +157,7 @@ Validator                               | Description
 **isOctal(str)**                        | check if the string is a valid octal number.
 **isPassportNumber(str, countryCode)**    | check if the string is a valid passport number.<br/><br/>`countryCode` is one of `['AM', 'AR', 'AT', 'AU', 'AZ', 'BE', 'BG', 'BY', 'BR', 'CA', 'CH', 'CN', 'CY', 'CZ', 'DE', 'DK', 'DZ', 'EE', 'ES', 'FI', 'FR', 'GB', 'GR', 'HR', 'HU', 'IE', 'IN', 'IR', 'ID', 'IS', 'IT', 'JM', 'JP', 'KR', 'KZ', 'LI', 'LT', 'LU', 'LV', 'LY', 'MT', 'MX', 'MY', 'MZ', 'NL', 'NZ', 'PH', 'PK', 'PL', 'PT', 'RO', 'RU', 'SE', 'SL', 'SK', 'TH', 'TR', 'UA', 'US', 'ZA']`.
 **isPort(str)**                         | check if the string is a valid port number.
-**isPostalCode(str, locale)**           | check if the string is a postal code.<br/><br/>`locale` is one of `['AD', 'AT', 'AU', 'AZ', 'BA', 'BE', 'BG', 'BR', 'BY', 'CA', 'CH', 'CN', 'CZ', 'DE', 'DK', 'DO', 'DZ', 'EE', 'ES', 'FI', 'FR', 'GB', 'GR', 'HR', 'HT', 'HU', 'ID', 'IE', 'IL', 'IN', 'IR', 'IS', 'IT', 'JP', 'KE', 'KR', 'LI', 'LK', 'LT', 'LU', 'LV', 'MG', 'MT', 'MX', 'MY', 'NL', 'NO', 'NP', 'NZ', 'PL', 'PR', 'PT', 'RO', 'RU', 'SA', 'SE', 'SG', 'SI', 'SK', 'TH', 'TN', 'TW', 'UA', 'US', 'ZA', 'ZM']` OR `'any'`. If 'any' is used, function will check if any of the locales match. Locale list is `validator.isPostalCodeLocales`.
+**isPostalCode(str, locale)**           | check if the string is a postal code.<br/><br/>`locale` is one of `['AD', 'AT', 'AU', 'AZ', 'BA', 'BE', 'BG', 'BR', 'BY', 'CA', 'CH', 'CN', 'CO', 'CZ', 'DE', 'DK', 'DO', 'DZ', 'EE', 'ES', 'FI', 'FR', 'GB', 'GR', 'HR', 'HT', 'HU', 'ID', 'IE', 'IL', 'IN', 'IR', 'IS', 'IT', 'JP', 'KE', 'KR', 'LI', 'LK', 'LT', 'LU', 'LV', 'MG', 'MT', 'MX', 'MY', 'NL', 'NO', 'NP', 'NZ', 'PL', 'PR', 'PT', 'RO', 'RU', 'SA', 'SE', 'SG', 'SI', 'SK', 'TH', 'TN', 'TW', 'UA', 'US', 'ZA', 'ZM']` OR `'any'`. If 'any' is used, function will check if any of the locales match. Locale list is `validator.isPostalCodeLocales`.
 **isRFC3339(str)**                      | check if the string is a valid [RFC 3339][RFC 3339] date.
 **isRgbColor(str [, includePercentValues])**                     | check if the string is a rgb or rgba color.<br/><br/>`includePercentValues` defaults to `true`. If you don't want to allow to set `rgb` or `rgba` values with percents, like `rgb(5%,5%,5%)`, or `rgba(90%,90%,90%,.3)`, then set it to false.
 **isSemVer(str)**                       | check if the string is a Semantic Versioning Specification (SemVer).
diff --git a/src/lib/isPostalCode.js b/src/lib/isPostalCode.js
index 99cba290b..103656205 100644
--- a/src/lib/isPostalCode.js
+++ b/src/lib/isPostalCode.js
@@ -19,6 +19,7 @@ const patterns = {
   CA: /^[ABCEGHJKLMNPRSTVXY]\d[ABCEGHJ-NPRSTV-Z][\s\-]?\d[ABCEGHJ-NPRSTV-Z]\d$/i,
   CH: fourDigit,
   CN: /^(0[1-7]|1[012356]|2[0-7]|3[0-6]|4[0-7]|5[1-7]|6[1-7]|7[1-5]|8[1345]|9[09])\d{4}$/,
+  CO: /^(05|08|11|13|15|17|18|19|20|23|25|27|41|44|47|50|52|54|63|66|68|70|73|76|81|85|86|88|91|94|95|97|99)(\d{4})$/,
   CZ: /^\d{3}\s?\d{2}$/,
   DE: fiveDigit,
   DK: fourDigit,
diff --git a/test/validators.test.js b/test/validators.test.js
index 8037acf37..414adbbd2 100644
--- a/test/validators.test.js
+++ b/test/validators.test.js
@@ -11955,6 +11955,21 @@ describe('Validators', () => {
           'Z1A 0B1',
         ],
       },
+      {
+        locale: 'CO',
+        valid: [
+          '050034',
+          '110221',
+          '441029',
+          '910001',
+        ],
+        invalid: [
+          '11001',
+          '000000',
+          '109999',
+          '329999',
+        ],
+      },
       {
         locale: 'ES',
         valid: [