Campaign Monitor List ID: How to Find Your Subscriber List ID

Your Campaign Monitor List ID is the unique identifier that tells the Contact Form 7 Campaign Monitor Extension exactly which subscriber list should receive your form submissions. In other words, if you have multiple lists in your Campaign Monitor account, the Campaign Monitor List ID ensures submissions land in the right one.

Additionally, while the plugin’s dropdown menu lets you select lists by name, entering the Campaign Monitor List ID directly gives you precise control. This is especially useful for agencies managing multiple clients or businesses with dozens of subscriber lists where scrolling through a dropdown becomes impractical.

Furthermore, this guide walks you through finding your Campaign Monitor List ID step by step, entering it into the plugin, and troubleshooting common issues.

Where to Find Your Campaign Monitor List ID

Your Campaign Monitor List ID is located in the list settings area. Specifically, follow these steps:

1. Log in to Campaign Monitor at campaignmonitor.com.
2. Click Lists & Subscribers in the main navigation.
3. Select the list you want to connect to your Contact Form 7 form.
4. Click Settings in the left sidebar menu for that list.
5. Scroll to the bottom of the settings page — the Campaign Monitor List ID (labeled “API Subscriber List ID”) is displayed at the bottom.

In addition, there is an alternative method: click “change name/type” next to the list name at the top of the list view. The List ID is displayed on that settings page as well.

What a Campaign Monitor List ID Looks Like

A Campaign Monitor List ID is a long alphanumeric string that looks like this:

a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6

Specifically, it contains 32 characters — a mix of lowercase letters and numbers. Every list in your Campaign Monitor account has its own unique ID. In fact, even if two lists have identical names, their List IDs are always different.

Moreover, the Campaign Monitor List ID never changes. You can rename a list, change its settings, or modify its custom fields, and the List ID remains the same. Consequently, once you enter it into the Contact Form 7 Campaign Monitor Extension, you never need to update it unless you delete and recreate the list.

Entering the Campaign Monitor List ID in WordPress

After copying your Campaign Monitor List ID from the Campaign Monitor settings page, follow these steps:

1. Open your WordPress admin and navigate to Contact > Contact Forms.
2. Edit the form you want to connect to Campaign Monitor.
3. Click the Campaign Monitor tab in the form editor.
4. Make sure your Campaign Monitor API key is already entered and validated.
5. Enter the List ID in the List ID field — this overrides the dropdown selection and targets the exact list you specified.
6. Click Save and submit a test entry to verify.

As a result, every form submission goes directly to the list matching that Campaign Monitor List ID, regardless of what the dropdown shows.

When to Use the Campaign Monitor List ID

The dropdown list selector works fine for most WordPress sites. However, there are situations where entering the Campaign Monitor List ID directly is the better approach:

• Multiple accounts — if you manage several Campaign Monitor accounts for different clients, using List IDs eliminates confusion between lists with similar names across accounts.
• Many lists — accounts with dozens of subscriber lists make the dropdown unwieldy. Pasting the exact List ID is faster and more reliable.
• Programmatic setup — if you are configuring forms via code or importing settings, the List ID is the unambiguous identifier that always works.
• Debugging — when troubleshooting why subscribers are not appearing in the expected list, comparing the List ID in the plugin with the List ID in Campaign Monitor confirms the connection is correct.

In short, the Campaign Monitor List ID is the definitive way to specify which list receives your form submissions.

Common Campaign Monitor List ID Issues

List ID not accepted

If the plugin rejects your Campaign Monitor List ID, check for trailing spaces or partial selections. Specifically, the ID must be exactly 32 characters. Copy it directly from the Campaign Monitor settings page and paste without modifications.

Subscribers going to the wrong list

This happens when the dropdown selection and the List ID field conflict. Consequently, if you are using the List ID field, make sure the dropdown is set to match or left at its default. The List ID field takes priority over the dropdown selection.

List ID changed after list deletion

If you deleted a list and recreated one with the same name, it gets a new Campaign Monitor List ID. In fact, Campaign Monitor never reuses List IDs. Update the List ID in your plugin settings to match the new list.

Campaign Monitor List ID vs Mailchimp List ID

If you have used the Contact Form 7 Mailchimp Extension, you may be familiar with Mailchimp’s audience ID (formerly called List ID). Similarly, Campaign Monitor’s List ID serves the same purpose — it uniquely identifies a subscriber list.

However, the format is different. Mailchimp audience IDs are 10 characters, while Campaign Monitor List IDs are 32 characters. Both systems use the ID as a permanent, unchanging identifier for each list.

Next Steps

After entering your Campaign Monitor List ID, you may also want to configure these features:

• Set up your Campaign Monitor API key — required before the List ID works.
• Add an opt-in checkbox — let visitors choose whether to subscribe.

Additionally, if you need help with your Campaign Monitor List ID or any other aspect of the plugin, contact us directly.