Company lists · Data refreshed September 2026
Top 25 Nonprofit mentoring organizations based in Boston, United States
RevenueBase identified 63 nonprofit mentoring organizations headquartered in Boston, United States as of September 2026 and tracks 1,548 professional contacts across them, including 388 with verified work emails. New York is the largest hub.
This list covers nonprofit mentoring organizations headquartered in Boston, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest nonprofit mentoring organizations based in Boston, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 327 contacts → | ||||
Indirect evidence “As one of the world’s largest and most impactful youth-serving NGOs, JA Worldwide delivers hands-on, immersive learning in entrepreneurship, work readiness, and financial health.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 184 contacts → | ||||
Indirect evidence “Artists For Humanity (AFH) harnesses the power of mentorship and paid professional experiences to inspire teens to build their future.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 136 contacts → | ||||
Indirect evidence “For more than 60 years, Big Brothers Big Sisters of Eastern Massachusetts has worked to ensure that every child has the support from caring adults that they need for healthy…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 126 contacts → | ||||
Partial evidence “MENTOR is the unifying champion for quality youth mentoring in the United States.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 106 contacts → | ||||
Indirect evidence “Tenacity is a city-wide Boston youth development organization focused on closing the achievement and opportunity gaps for underserved Boston youth.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 66 contacts → | ||||
Indirect evidence “Boston SCORES provides urban youth with team-based education programs that promote health & well-being, academic engagement, and civic leadership.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 62 contacts → | ||||
Indirect evidence “Teen Empowerment (TE) inspires inner-city youth to think deeply about the most difficult issues in their communities and provides them with the tools they need to work together to…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 49 contacts → | ||||
Indirect evidence “The mission of St.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 41 contacts → | ||||
Indirect evidence “Our Mission Boston Partners in Education enhances the academic achievement and nurtures the personal growth of Boston's public school students by providing them with focused…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 39 contacts → | ||||
Partial evidence “Our mission is to empower youth in foster care to thrive through committed mentoring relationships and the development of essential life skills.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 36 contacts → | ||||
Indirect evidence “We believe in a more equitable future where every student has the network and guidance to achieve their goals.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 35 contacts → | ||||
Indirect evidence “Minds Matter Boston connects driven and determined students from low-income families with the people, preparation, and possibilities to succeed in college, create their future…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 31 contacts → | ||||
Partial evidence “Friends of the Children-Boston (Friends-Boston) creates generational change by engaging children from high-risk communities in twelve and a half years of transformative mentoring…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 27 contacts → | ||||
Partial evidence “IMFAHE is a non-profit, global mentoring program that connects European students, emigrated professionals and partners in the disciplines of Biomedicine, Engineering, and…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 24 contacts → | ||||
Indirect evidence “ARKanum brings teens with mentors as a family, fostering key character building skills that will help them on their way to lifelong success.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 22 contacts → | ||||
Partial evidence “Mass Mentoring Partnership (MMP), is committed to ensuring that all young people in Massachusetts have the mentoring relationships they need to develop into thriving, engaged…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 22 contacts → | ||||
Partial evidence “Founded in 1998, Inspire is a 501(c)(3) nonprofit offering management and strategy consulting services to leading nonprofit organizations across the United States.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 16 contacts → | ||||
Indirect evidence “The Boston Higher Education Resource Center (HERC) serves under-represented students in grades 9-12 and their families.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 11 contacts → | ||||
Indirect evidence “Alray envisions a day when all Boston students will have access to the financial, academic, and emotional support they need to enroll in college, graduate, and be economically…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 9 contacts → | ||||
Partial evidence “MentorPRO is a cutting-edge, evidence-based mentoring platform designed to help organizations launch, manage, and scale effective mentoring programs across education, workforce…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 8 contacts → | ||||
Indirect evidence “At One Bead, we partner exclusively with elementary and middle schools in low-income communities where students identify predominantly as African American or Hispanic/Latino.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 2 contacts → | ||||
Indirect evidence “Morelli Associates specializes in Non-Profit Business Consulting and Strategic Coaching for Staff and Board Leadership focused on Margin for Mission while eliminating…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 2 contacts → | ||||
Partial evidence “Global Deeds is devoted to disrupting the cycle of poverty by assisting schools, nonprofits, and corporations to empower disadvantaged youth through innovative educational and…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 2 contacts → | ||||
Partial evidence “Partnering with nonprofit organizations and small businesses and their leaders to provide the financial expertise and guidance essential for their long-term success.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 1 contacts → | ||||
Indirect evidence “Our mission is to foster greater equitable prosperity and well-being through all-inclusive coaching and educational programs.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: nonprofit mentoring organizations. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names nonprofit mentoring organizations.
- Partial evidence
- Its own public description names part of nonprofit mentoring organizations, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name nonprofit mentoring organizations. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 63 nonprofit mentoring organizations based in Boston, United States
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Nonprofit mentoring organizations based in Boston, United States at a glance
As of Sep 20, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than for Boston, so it is reported there. Company counts and contact totals on this page are exact for Boston, over 63 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among nonprofit mentoring organizations, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Boston, United States whose own description of what they do matches “nonprofit mentoring organizations”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names nonprofit mentoring organizations), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among nonprofit mentoring organizations, and records with no verified work email. Companies headquartered outside Boston are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 388 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Nonprofit mentoring organizations by metro in the United States
- Nonprofit mentoring organizations in New York220
- Nonprofit mentoring organizations in Los Angeles150
- Nonprofit mentoring organizations in Chicago149
- Nonprofit mentoring organizations in Atlanta107
- Nonprofit mentoring organizations in Washington100
- Nonprofit mentoring organizations in Houston81
- Nonprofit mentoring organizations in Dallas71
- Nonprofit mentoring organizations in Boston63
- Nonprofit mentoring organizations in San Francisco61
- Nonprofit mentoring organizations in Seattle56
- Nonprofit mentoring organizations in Charlotte52
- Nonprofit mentoring organizations in Philadelphia50
- Nonprofit mentoring organizations in Miami49
- Nonprofit mentoring organizations in Portland45
- Nonprofit mentoring organizations in Denver44
- Nonprofit mentoring organizations in San Diego43
- Nonprofit mentoring organizations in Baltimore42
- Nonprofit mentoring organizations in Oakland41
- Nonprofit mentoring organizations in Austin40
- Nonprofit mentoring organizations in Detroit39
- Nonprofit mentoring organizations in Orlando38
- Nonprofit mentoring organizations in Indianapolis37
- Nonprofit mentoring organizations in Minneapolis36
- Nonprofit mentoring organizations in Columbus35
- Nonprofit mentoring organizations in Cincinnati31
- Nonprofit mentoring organizations in Las Vegas31
- Nonprofit mentoring organizations in Phoenix31
- Nonprofit mentoring organizations in San Jose29
- Nonprofit mentoring organizations in Tampa29
- Nonprofit mentoring organizations in Raleigh28
- Nonprofit mentoring organizations in Pittsburgh27
- Nonprofit mentoring organizations in Sacramento27
- Nonprofit mentoring organizations in Richmond25
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names nonprofit mentoring organizations, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many nonprofit mentoring organizations are there based in Boston, United States?
RevenueBase identified 63 nonprofit mentoring organizations headquartered in Boston, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
JA Worldwide, headquartered in Boston, tops this list with the largest team on record.
Which city has the most nonprofit mentoring organizations?
New York leads with 220 headquartered companies, followed by Los Angeles (150) and Chicago (149).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 388 verified decision-maker contacts tracked across these 63 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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