faxNumber

faxNumber · Optional

Appears in

Organization

What is it?

faxNumber is the fax contact number for an organization. It follows the same format conventions as telephone, a plain text string representing the fax number, preferably in international E.164 format with country code.

While fax communication is uncommon in most industries today, certain sectors including healthcare, legal, government, and financial services still use fax as a primary document transmission method. For these organizations, declaring faxNumber in structured data makes the number machine-readable and attributable to the correct entity.

Why this matters for AEO

AI answer engines responding to queries like "how do I send a fax to [organization]?" can pull faxNumber from structured data. In regulated industries where fax remains a compliance requirement, submitting claims to insurance companies, sending legal filings, transmitting medical records, having structured data for the fax number reduces friction in document workflows.

Google does not currently feature faxNumber in rich results, but it contributes to the completeness of an organization's structured data entity, which supports Knowledge Graph confidence.

What the specs say

Schema.org:faxNumber expects Text. "The fax number." [Source: https://schema.org/faxNumber]

Google: Not mentioned in Google's structured data documentation for Organization. No Google-specific requirements apply.

How to find your value

Use the same fax number listed on your official letterhead, contact page, or regulatory filings. For organizations with multiple departments or locations, use the primary public-facing fax number, or add faxNumber to individual ContactPoint objects for department-level specificity.

Format and code

Use E.164 international format where possible:

{
  "@context": "https://schema.org",
  "@type": "Organization",
  "name": "Memorial Hospital",
  "telephone": "+13125550100",
  "faxNumber": "+13125550199"
}

With ContactPoint for department-specific fax:

{
  "@context": "https://schema.org",
  "@type": "Organization",
  "name": "Memorial Hospital",
  "contactPoint": [
    {
      "@type": "ContactPoint",
      "contactType": "patient records",
      "faxNumber": "+13125550188",
      "telephone": "+13125550100"
    },
    {
      "@type": "ContactPoint",
      "contactType": "billing",
      "faxNumber": "+13125550177"
    }
  ]
}

Webflow implementation

Static pages

Add to your Organization JSON-LD block:

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Organization",
  "name": "Your Organization",
  "telephone": "+15555550100",
  "faxNumber": "+15555550199"
}
</script>

CMS template pages

If managing multiple locations with different fax numbers, add a plain text CMS field and bind it:

"faxNumber": "{{wf {"path":"fax-number"} }}"

In Schema HQ

faxNumber is emitted in the Organization schema configuration. Enter it alongside telephone in the contact information section.

Real examples

County Health Department :

{
  "@context": "https://schema.org",
  "@type": "GovernmentOrganization",
  "name": "Cook County Department of Public Health",
  "telephone": "+17085550100",
  "faxNumber": "+17085550199",
  "address": {
    "@type": "PostalAddress",
    "streetAddress": "69 W. Washington St",
    "addressLocality": "Chicago",
    "addressRegion": "IL",
    "postalCode": "60602"
  }
}

Related fields

• telephone — primary voice contact number
• email — email contact address
• contactPoint — structured contact channel with type and availability
• address — physical address

FAQ

Is faxNumber still worth adding in 2024?

For most consumer-facing businesses, no. For healthcare providers, law firms, government agencies, insurance companies, and financial services firms, yes. These sectors often have regulatory requirements specifying fax as an accepted transmission method. Machine-readable structured data for fax numbers benefits automated workflows in these industries.

Can faxNumber appear in ContactPoint as well as directly on Organization?

Yes. faxNumber is a property of ContactPoint as well as Organization. If your organization has department-specific fax numbers, use contactPoint arrays with faxNumber on each. If there is only one organization-wide fax, put it directly on the Organization object.

What format should I use for international fax numbers?

E.164 international format: +[country code][area code][number] with no spaces or punctuation, e.g., +12125550100. This format is unambiguous for automated systems processing the number.