How many email patterns does GuideStar use?

GuideStar uses 9 known email patterns.

What domain does GuideStar use for work emails?

GuideStar uses guidestar.org for work email addresses.

Most Common Email Formats at GuideStar

GuideStar's most common email format is First.Last@guidestar.org (ex. John.Doe@guidestar.org), used for 53% of guidestar.org addresses. GuideStar uses 8 email patterns across 2 domains: guidestar.org and candid.org. Percentages are the share of addresses within each domain.

@guidestar.org

4 patterns

Format	Example	Share of guidestar.org
First.Last@guidestar.orgMost common	John.Doe@guidestar.org	53%
FLast@guidestar.org	JDoe@guidestar.org	40%
First_Last@guidestar.org	John_Doe@guidestar.org	4%
FirLast@guidestar.org	JohDoe@guidestar.org	3%

@candid.org

4 patterns

Format	Example	Share of candid.org
First.Last@candid.orgMost common	John.Doe@candid.org	96%
Last@candid.org	Doe@candid.org	2%
First.Middle@candid.org	John.Michael@candid.org	1%
First-Last@candid.org	John-Doe@candid.org	1%

Need a specific person's email?

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Frequently Asked Questions

What does GuideStar do?

GuideStar was founded in 1994 and operates in the Non-profit Organizations industry, alongside similar companies like Catholic Charities, American Cancer Society and Charity Navigator. You can visit candid.org or contact GuideStar's headquarters by phone at

+1-757-229-****

. Explore GuideStar's company overview page for more information.

What is GuideStar's email address format?

GuideStar's email format typically follows the pattern of First.Last@guidestar.org; this email format is used 53% of the time. Other contacts within LeadIQ's database had email formats such as FLast@guidestar.org and First_Last@guidestar.org. Looking for more contact data? Unlock accurate emails and phone numbers from millions of profiles verified in real-time.

How many employees does GuideStar have currently?

GuideStar has approximately 53 employees as of October 2026. Key team members to contact include Ceo: F. R., Ceo/ Owner: Q. L. B. O. and Associate Vice President For Human Resou: T. W. For more team information and contact data, explore GuideStar's employee directory with LeadIQ.

GuideStar Email Format

Q: What is GuideStar's email address format?

GuideStar's email format typically follows the pattern of ${fn}.${ln}. Other email formats include ${fi}${ln} and ${fn}_${ln}.

Non-profit OrganizationsNew York, United States51-200 Employees

Candid is a data and research organization serving the nonprofit sector, formed by the merger of Foundation Center and GuideStar. It aggregates and analyzes information about nonprofits, foundations, and grants to illuminate funding sources, flows, and their implications. Through research, collaboration, and training, Candid provides access to one of the most comprehensive sets of nonprofit and foundation data available, enabling stakeholders to locate essential resources and understand the funding landscape. Based in New York City, New York, Candid operates within the nonprofit sector as a data and research resource provider. It describes itself as an equal opportunity employer focused on inclusion and diversity. In June 2026, governance updates included new appointments to the Board of Trustees and the appointment of an interim President and CEO.

Most common format

First.Last@guidestar.org

Example: John.Doe@guidestar.org

8 patterns across 2 domains. See all formats

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Most Common Email Formats at GuideStar

@guidestar.org

@candid.org

Need a specific person's email?

Frequently Asked Questions

What does GuideStar do?

What is GuideStar's email address format?

How many employees does GuideStar have currently?

GuideStar Email Format

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What you can expect from LeadIQ:

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Everything for prospecting,
in one platform.