diff --git a/src/mixins/validation-mixin.ts b/src/mixins/validation-mixin.ts
index e0fa638d..332b74c1 100644
--- a/src/mixins/validation-mixin.ts
+++ b/src/mixins/validation-mixin.ts
@@ -40,7 +40,8 @@ export default class ValidationMixin extends Vue {
                 case 'maxLength': obj[prop].push(() => this.maxLengthRule(model, prop)); break
                 case 'isCanada': obj[prop].push(() => this.isCanadaRule(model, prop)); break
                 case 'isBC': obj[prop].push(() => this.isBCRule(model, prop)); break
-                case 'validatePostalCode': obj[prop].push(() => this.postalCodeRule(model, prop)); break
+                case 'isValidPostalCode': obj[prop].push(() => this.isValidPostalCodeRule(model, prop)); break
+                case 'isRequiredPostalCode': obj[prop].push(() => this.isRequiredPostalCodeRule(model, prop)); break
                 // FUTURE: add extra validation functions here
                 default: break
               }
@@ -89,7 +90,11 @@ export default class ValidationMixin extends Vue {
     return Boolean(this.$v[prop] && this.$v[prop][key].isBC) || 'Address must be in BC'
   }
 
-  protected postalCodeRule (prop: string, key: string): boolean | string {
-    return Boolean(this.$v[prop] && this.$v[prop][key].validatePostalCode) || 'Enter a valid postal code'
+  protected isValidPostalCodeRule (prop: string, key: string): boolean | string {
+    return Boolean(this.$v[prop] && this.$v[prop][key].isValidPostalCode) || 'Enter a valid postal code'
+  }
+
+  protected isRequiredPostalCodeRule (prop: string, key: string): boolean | string {
+    return Boolean(this.$v[prop] && this.$v[prop][key].isRequiredPostalCode) || 'This field is required'
   }
 }
diff --git a/src/validators/index.ts b/src/validators/index.ts
index cdcdae5d..3b15f34e 100644
--- a/src/validators/index.ts
+++ b/src/validators/index.ts
@@ -1 +1,2 @@
-export * from './validate-postal-code'
+export * from './is-valid-postal-code'
+export * from './is-required-postal-code'
diff --git a/src/validators/is-required-postal-code.ts b/src/validators/is-required-postal-code.ts
new file mode 100644
index 00000000..5ef87062
--- /dev/null
+++ b/src/validators/is-required-postal-code.ts
@@ -0,0 +1,25 @@
+/**
+ * Countries that do not use postal codes.
+ * Postal code is not required for addresses in these countries.
+ */
+const NO_POSTAL_CODE_COUNTRY_CODES = new Set([
+  'AO', 'AG', 'AW', 'BS', 'BZ', 'BJ', 'BM', 'BO', 'BQ', 'BW', 'BF', 'BI',
+  'CM', 'CF', 'TD', 'KM', 'CG', 'CD', 'CK', 'CI', 'CW', 'DJ', 'DM', 'GQ',
+  'ER', 'FJ', 'TF', 'GA', 'GM', 'GH', 'GD', 'GY', 'HM', 'HK',
+  'KI', 'KP', 'LY', 'MO', 'MW', 'ML', 'MR', 'NR',
+  'AN', 'NU', 'QA', 'RW', 'KN', 'ST', 'SC', 'SL', 'SX', 'SB', 'SO', 'SR', 'SY',
+  'TL', 'TG', 'TK', 'TO', 'TT', 'TV', 'UG', 'AE', 'VU', 'YE', 'ZW'
+])
+
+/**
+ * Custom validator for postal code required.
+ * Returns true if postal code has a value, or if the country doesn't use postal codes.
+ */
+export function isRequiredPostalCode (value: string, parentVm: any): boolean {
+  // If the country doesn't use postal codes, no value is required
+  if (NO_POSTAL_CODE_COUNTRY_CODES.has(parentVm.addressCountry)) {
+    return true
+  }
+  // Otherwise, postal code is required
+  return !!value?.trim()
+}
diff --git a/src/validators/validate-postal-code.ts b/src/validators/is-valid-postal-code.ts
similarity index 87%
rename from src/validators/validate-postal-code.ts
rename to src/validators/is-valid-postal-code.ts
index 347a5754..243b31fd 100644
--- a/src/validators/validate-postal-code.ts
+++ b/src/validators/is-valid-postal-code.ts
@@ -5,7 +5,7 @@
 const CanadaPostalCodeRegex = /^[ABCEGHJ-NPRSTVXY][0-9][ABCEGHJ-NPRSTV-Z][ ]?[0-9][ABCEGHJ-NPRSTV-Z][0-9]$/i
 
 /** Custom validator for postal codes. */
-export function validatePostalCode (value: string, parentVm: any): boolean {
+export function isValidPostalCode (value: string, parentVm: any): boolean {
   // if Canada, validate postal code format
   // empty value is considered valid -- "required" validation is handled separately
   if (parentVm.addressCountry === 'CA') return !value || CanadaPostalCodeRegex.test(value)
diff --git a/tests/unit/is-required-postal-code.spec.ts b/tests/unit/is-required-postal-code.spec.ts
new file mode 100644
index 00000000..7d18c834
--- /dev/null
+++ b/tests/unit/is-required-postal-code.spec.ts
@@ -0,0 +1,55 @@
+import Vue from 'vue'
+import { shallowMount } from '@vue/test-utils'
+import { isRequiredPostalCode } from '@/validators'
+
+const Dummy = Vue.component('DummyComponent', { template: '<div />' })
+
+describe('Validate Postal Code Required', () => {
+  let vm: any
+
+  beforeAll(async () => {
+    // mount the component and wait for everything to stabilize
+    // (this can be any component since we are not really using it)
+    const wrapper = shallowMount(Dummy)
+    vm = wrapper.vm
+    await Vue.nextTick()
+  })
+
+  it.each([
+    'A1A 1A1',
+    '12345',
+    'some-postal-code',
+    '   value   '
+  ])('returns true when postal code "%s" is provided for a country requiring postal codes', (postalCode) => {
+    expect(isRequiredPostalCode(postalCode, { addressCountry: 'CA' })).toBe(true)
+    expect(isRequiredPostalCode(postalCode, { addressCountry: 'US' })).toBe(true)
+  })
+
+  it.each([
+    '',
+    '   ',
+    null,
+    undefined
+  ])('returns false when postal code is "%s" for a country requiring postal codes', (postalCode) => {
+    expect(isRequiredPostalCode(postalCode as any, { addressCountry: 'CA' })).toBe(false)
+    expect(isRequiredPostalCode(postalCode as any, { addressCountry: 'US' })).toBe(false)
+  })
+
+  it.each([
+    'AO', 'AG', 'AW', 'BS', 'BZ', 'BJ', 'BM', 'BO', 'BQ', 'BW', 'BF', 'BI',
+    'CM', 'CF', 'TD', 'KM', 'CG', 'CD', 'CK', 'CI', 'CW', 'DJ', 'DM', 'GQ',
+    'ER', 'FJ', 'TF', 'GA', 'GM', 'GH', 'GD', 'GY', 'HM', 'HK',
+    'KI', 'KP', 'LY', 'MO', 'MW', 'ML', 'MR', 'NR',
+    'AN', 'NU', 'QA', 'RW', 'KN', 'ST', 'SC', 'SL', 'SX', 'SB', 'SO', 'SR', 'SY',
+    'TL', 'TG', 'TK', 'TO', 'TT', 'TV', 'UG', 'AE', 'VU', 'YE', 'ZW'
+  ])('returns true for country "%s" even when postal code is empty', (countryCode) => {
+    expect(isRequiredPostalCode('', { addressCountry: countryCode })).toBe(true)
+    expect(isRequiredPostalCode('   ', { addressCountry: countryCode })).toBe(true)
+  })
+
+  it.each([
+    'AO', 'HK', 'AE', 'QA', 'ZW'
+  ])('returns true for country "%s" when postal code is provided', (countryCode) => {
+    expect(isRequiredPostalCode('12345', { addressCountry: countryCode })).toBe(true)
+  })
+})
diff --git a/tests/unit/validate-postal-code.spec.ts b/tests/unit/is-valid-postal-code.spec.ts
similarity index 64%
rename from tests/unit/validate-postal-code.spec.ts
rename to tests/unit/is-valid-postal-code.spec.ts
index 4d964186..2cda7c7c 100644
--- a/tests/unit/validate-postal-code.spec.ts
+++ b/tests/unit/is-valid-postal-code.spec.ts
@@ -1,6 +1,6 @@
 import Vue from 'vue'
 import { shallowMount } from '@vue/test-utils'
-import { validatePostalCode } from '@/validators'
+import { isValidPostalCode } from '@/validators'
 
 const Dummy = Vue.component('DummyComponent', { template: '<div />' })
 
@@ -22,7 +22,7 @@ describe('Validate Postal Code', () => {
     'a1a 1a1',
     'a1a1a1'
   ])('accepts valid postal code "%s" for Canada', (postalCode) => {
-    expect(validatePostalCode(postalCode, { addressCountry: 'CA' })).toBe(true)
+    expect(isValidPostalCode(postalCode, { addressCountry: 'CA' })).toBe(true)
   })
 
   it.each([
@@ -40,7 +40,7 @@ describe('Validate Postal Code', () => {
     'W1W 1W1', // W is not allowed in Canadian postal codes
     'Z1Z 1Z1' // Z is not allowed in Canadian postal codes
   ])('rejects invalid postal code "%s" for Canada', (postalCode) => {
-    expect(validatePostalCode(postalCode, { addressCountry: 'CA' })).toBe(false)
+    expect(isValidPostalCode(postalCode, { addressCountry: 'CA' })).toBe(false)
   })
 
   it.each([
@@ -52,6 +52,20 @@ describe('Validate Postal Code', () => {
     'W1W 1W1',
     'Z1Z 1Z1'
   ])('accepts any postal code "%s" for non-Canada', (postalCode) => {
-    expect(validatePostalCode(postalCode, { addressCountry: 'XX' })).toBe(true)
+    expect(isValidPostalCode(postalCode, { addressCountry: 'XX' })).toBe(true)
+  })
+
+  it.each([
+    null,
+    undefined
+  ])('accepts %s postal code for Canada', (postalCode) => {
+    expect(isValidPostalCode(postalCode as any, { addressCountry: 'CA' })).toBe(true)
+  })
+
+  it.each([
+    null,
+    undefined
+  ])('accepts %s postal code for non-Canada', (postalCode) => {
+    expect(isValidPostalCode(postalCode as any, { addressCountry: 'XX' })).toBe(true)
   })
 })