What is a ZIP Code? Meaning, format, and how to use it on Grey

If you have ever tried to sign up for Upwork, Fiverr, PayPal, or any international payment platform, you have probably encountered a ZIP code field and didn't know what to enter. This is one of the most common points of confusion for Nigerian, Kenyan, and Ghanaian users setting up foreign accounts. This guide explains what a ZIP code is, why platforms ask for one, and exactly what to enter when using your Grey account.
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A ZIP code stands for Zone Improvement Plan code. It is a five-digit number introduced by the United States Postal Service in 1963 to speed up and improve mail sorting. Each ZIP code identifies a specific geographic area: a city, a neighbourhood, or even a single large building in dense urban areas.
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Over time, ZIP codes moved beyond mail delivery. Banks, payment processors, and online platforms adopted them as a standard field for address verification. When a platform asks for your ZIP code, it is usually checking that the address you entered matches the address on file with the bank or payment provider.
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They are essentially the same thing used in different countries. ZIP code is the US term. Postal code is the international term. The format varies by country:

Nigeria, Kenya, and Ghana all have official postal code systems, but they are not widely used in everyday transactions. Most international platforms are unaware of them. This is why, when you encounter a ZIP code field on an international form, you should not enter your local postal code. You should enter the ZIP code associated with the foreign account you are using.
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Most international payment systems, freelance platforms, and financial services were built with US and European address standards in mind. They use ZIP codes as an address verification tool: they check whether the ZIP code you enter matches the one the bank has on file for that account.

This comes up most often in these situations:

The key rule: always use the ZIP code that matches the US address associated with your account. For Grey users, that is the ZIP code shown in your Grey USD account details — not your home address in Nigeria, Kenya, or Ghana.
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The ZIP code to use in every case below is the one shown in your Grey USD account details. Open the Grey app, go to your USD wallet, tap account details, and find the full US address. The ZIP code is part of that address.
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When adding your Grey USD account as a payment method on Upwork, Upwork asks for the routing number, account number, and bank address, including ZIP code. Enter the address and ZIP code exactly as shown in your Grey account details. Upwork verifies these against the bank's records. If they do not match, the payment method will be rejected.
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Fiverr asks for a ZIP code when you set up a US bank account for withdrawals. Use the ZIP code from your Grey account details. Do not enter your Nigerian or Kenyan postal code. Fiverr will not recognise it as a US withdrawal account.
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If you are adding your Grey account as a bank account in PayPal or entering a billing address during PayPal setup, use the ZIP code from your Grey account details. PayPal's address verification system checks this against the bank's records. A mismatch will cause the linking to fail.
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Payoneer may ask for a ZIP code when you verify your US bank account. Use the ZIP code from your Grey USD account details. This applies both when adding Grey as a bank account and when completing KYC verification for US Payoneer accounts.
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Amazon's payment forms ask for the full bank address, including ZIP code. Use the routing number, account number, and address from your Grey USD account details exactly as shown. Amazon's payment systems are strict about address matching.
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When entering bank details for Stripe payouts, use the routing number, account number, and the ZIP code from your Grey account details. Stripe uses the ZIP code to verify the account address during bank account validation.
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If your employer or client pays you through Deel or Remote using a US bank transfer, these platforms may ask for your bank address and ZIP code during setup. Use the address and ZIP code from your Grey USD account details.
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Finding your ZIP code on Grey takes under a minute:

This is the only ZIP code you should use for any platform where you have entered your Grey USD account details. Do not use a different ZIP code, even if you know a valid US ZIP code from another source. The platform will verify it against the bank's records, and only the ZIP code in your Grey account details will match.
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The platform's address verification system will reject the entry. Depending on the platform, you may see an error such as 'bank account verification failed,' 'address does not match,' or 'invalid routing number.' The payment method will not be added until the correct ZIP code is entered.
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If you are certain you entered the ZIP code correctly from your Grey account details and it is still being rejected, contact Grey support through the app. Some platforms have specific formatting requirements (for example, they may not accept the ZIP+4 extended format, such as 10001-1234, and only accept the standard 5-digit format). The support team can clarify what format the platform expects.
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Different Grey account types may be associated with different US addresses and ZIP codes depending on the banking partner. Always use the one shown in your actual Grey account details. The table below shows common US ZIP codes for reference only:

Do not use these reference ZIP codes when setting up your accounts. Always use the ZIP code shown in your Grey app under your USD wallet account details.
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If you use a Grey virtual dollar card for subscriptions, online purchases, or platform payments, the billing ZIP code is different from the ZIP code for your bank account. When a platform asks for the billing ZIP code on your card, use the ZIP code linked to your Grey card, not your bank account ZIP code.

To find your card's billing ZIP code: open the Grey app, go to Cards, select your virtual card, and view the card details. The billing address and ZIP code are shown there. Use this ZIP code specifically for card-based payments, and use the bank account ZIP code specifically for direct bank transfer setups.
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A ZIP code (Zone Improvement Plan code) is a five-digit number used in the United States to identify a specific geographic area for mail delivery and address verification. Other countries use similar systems: postcodes in the UK, PIN codes in India, and postal codes in Canada.
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Nigeria does not use ZIP codes. Nigeria has a postal code system managed by NIPOST, but it is not widely used in everyday transactions. When international platforms ask for a ZIP code, they are asking for a US postal code associated with your account address, not a Nigerian one. If you have a Grey USD account, use the ZIP code shown in your Grey account details.
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Open the Grey app, go to your bank account, and tap account details. The full account address, including ZIP code, is displayed there. Use this ZIP code on any platform that asks for one alongside your Grey account details.

Use the ZIP code from your Grey bank account details. Open the Grey app, go to your bank account, tap Account Details, and use the ZIP code shown next to your address. Do not use a Nigerian or Kenyan postal code.
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Use the ZIP code from your Grey bank account details. It must match the address associated with your Grey account, not your local address.
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If you are linking your Grey USD account to PayPal or entering a billing address, use the ZIP code from your Grey USD account details. Do not use a Nigerian or Kenyan postal code as PayPal will not recognise it for a US account.
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The platform will reject the address verification, and your payment method or withdrawal will fail. Always copy the ZIP code exactly as shown in your Grey account details. If the correct ZIP code is still being rejected, contact Grey support through the app.
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No. Senders do not need your ZIP code to send money to your Grey USD account. They only need your routing number, account number or account details. The ZIP code only appears when you enter your Grey account as a withdrawal destination on a platform.
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