# ZIP/Postal code

To connect to a proxy using a ZIP code, add and specify the `postalcode` parameter with a **five-digit** ZIP code in the username. This parameter must be used combined with the country code parameter `cc` and a case-insensitive country code in 2-letter [**3166-1 alpha-2 format**](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2). 

Here is an example of the username:\
`customer-USERNAME-cc-US-postalcode-90210`

{% hint style="info" %}
Currently we support only US-based codes for ZIP code targeting. 
{% endhint %}

{% hint style="info" %}
Proxy location using ZIP code is being matched using [**MaxMind IP Geolocation**](https://www.maxmind.com/en/geoip-demo) database. There can be a mismatch between ZIP codes when checking IP addresses against other IP geo-location databases.
{% endhint %}

#### Code examples

In this example, a query to `ip.oxylabs.io/location` is performed from a proxy located in the United States with a ZIP code `90210`:

{% tabs %}
{% tab title="cURL" %}

```shell
curl -x pr.oxylabs.io:7777 -U "customer-USERNAME-cc-US-postalcode-90210:PASSWORD" https://ip.oxylabs.io/location
```

{% endtab %}

{% tab title="PHP" %}

```php
<?php
$username = 'USERNAME';
$password = 'PASSWORD';
$country = 'US';
$postalcode = '90210';
$proxy = 'pr.oxylabs.io:7777';
$query = curl_init('https://ip.oxylabs.io/location');
curl_setopt($query, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($query, CURLOPT_PROXY, "http://$proxy");
curl_setopt($query, CURLOPT_PROXYUSERPWD, "customer-$username-cc-$country-postalcode-$postalcode:$password");
$output = curl_exec($query);
curl_close($query);
if ($output)
    echo $output;
?>
```

{% endtab %}

{% tab title="Python" %}

```python
import urllib.request
import random
username = 'USERNAME'
password = 'PASSWORD'
country = 'US'
postalcode = '90210'
entry = ('http://customer-%s-cc-%s-postalcode-%s:%s@pr.oxylabs.io:7777' %
    (username, country, postalcode, password))
query = urllib.request.ProxyHandler({
    'http': entry,
    'https': entry,
})
execute = urllib.request.build_opener(query)
print(execute.open('https://ip.oxylabs.io/location').read())
```

{% endtab %}

{% tab title="Java" %}

```java
package example;

import org.apache.http.HttpHost;
import org.apache.http.client.fluent.*;

public class Example {
    public static void main(String[] args) throws Exception {
        HttpHost entry = new HttpHost("pr.oxylabs.io", 7777);
        String query = Executor.newInstance()
            .auth(entry, "customer-USERNAME-cc-US-postalcode-90210", "PASS")
            .execute(Request.Get("https://ip.oxylabs.io/location").viaProxy(entry))
            .returnContent().asString();
        System.out.println(query);
    }
}
```

{% endtab %}

{% tab title="C#" %}

```csharp
using System;
using System.Net;

class Example
{
    static void Main()
    {
        var client = new WebClient();
        client.Proxy = new WebProxy("pr.oxylabs.io:7777");
        client.Proxy.Credentials = new NetworkCredential("customer-USERNAME-cc-US-postalcode-90210", "PASSWORD");
        Console.WriteLine(client.DownloadString("https://ip.oxylabs.io/location"));
    }
}
```

{% endtab %}

{% tab title="Ruby" %}

```ruby
require 'uri'
require 'net/http'

uri = URI.parse('https://ip.oxylabs.io/location')
proxy = Net::HTTP::Proxy('pr.oxylabs.io', 7777, 'customer-USERNAME-cc-US-postalcode-90210', 'PASSWORD')

req = Net::HTTP::Get.new(uri.path)

result = proxy.start(uri.host,uri.port) do |http|
    http.request(req)
end

puts result.body
```

{% endtab %}
{% endtabs %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://developers.oxylabs.io/products/proxies/residential-proxies/location-settings/zip-postal-code.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.