Company lists · Data refreshed September 2026

Top 25 Progressive schools based in Philadelphia, United States

Name: Progressive schools based in Philadelphia, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 43 companies tracked

RevenueBase identified 43 progressive schools headquartered in Philadelphia, United States as of September 2026 and tracks 2,667 professional contacts across them, including 1,405 with verified work emails. New York is the largest hub.

This list covers progressive schools headquartered in Philadelphia, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

43Companies

2,667Contacts tracked

1,405Verified emails

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The 25 largest progressive schools based in Philadelphia, United States

Ranked by team size

Top 25 of 43 progressive schools based in Philadelphia, United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to progressive schools: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Mastery Schools	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,031 contacts →
	Partial evidence “Mastery Charter Schools and Mastery Schools of Camden form a non-profit school network of charter, turnaround and renaissance schools in Philadelphia, PA and Camden, NJ, serving…” Source: RevenueBase Database · checked Sep 20, 2026
2	Springside Chestnut Hill Academy	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	201-500	257 contacts →
	Indirect evidence “At Springside Chestnut Hill Academy, we offer a unique educational model that empowers its younger students with a single-sex education in Pre-K through 8th and a coed experience…” Source: RevenueBase Database · checked Sep 20, 2026
3	Freire Schools	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	51-200	143 contacts →
	Partial evidence “Since Freire Schools has been a catalyst for unlocking the potential of some of Philadelphia and Wilmington’s most underserved youth.” Source: RevenueBase Database · checked Sep 20, 2026
4	Friends Select School	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	51-200	138 contacts →
	Partial evidence “Friends Select School is a coed, college preparatory, Quaker day school serving 639 students in grades pre-k through 12.” Source: RevenueBase Database · checked Sep 20, 2026
5	String Theory Schools	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	201-500	119 contacts →
	Partial evidence “String Theory Schools is a premier education management organization committed to empowering students with the skills and knowledge to excel in all aspects of life.” Source: RevenueBase Database · checked Sep 20, 2026
6	Gesu School	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	51-200	114 contacts →
	Partial evidence “Located in North Philadelphia, Gesu School is an independent Catholic School (Pre-K to 8th grade) serving 450 students.” Source: RevenueBase Database · checked Sep 20, 2026
7	St. James School	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	51-200	110 contacts →
	Indirect evidence “St.” Source: RevenueBase Database · checked Sep 20, 2026
8	The City School	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	51-200	110 contacts →
	Partial evidence “The City School's mission is to train students’ minds, disciple their hearts and bring light to the city-one child at a time.” Source: RevenueBase Database · checked Sep 20, 2026
9	The Philadelphia School	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	51-200	87 contacts →
	Partial evidence “The Philadelphia School is a coeducational, nonsectarian independent school educating children from preschool through eighth grade.” Source: RevenueBase Database · checked Sep 20, 2026
10	Russell Byers Charter School	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	51-200	60 contacts →
	Partial evidence “The Russell Byers Charter School provides students roots, a safe, stimulating environment with a rigorous academic education grounded in Expeditionary Learning.” Source: RevenueBase Database · checked Sep 20, 2026
11	Philadelphia Outward Bound School	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	11-50	46 contacts →
	Indirect evidence “Outward Bound, founded in 1941 by educator Kurt Hahn, is a non-profit educational organization that serves people of all ages and backgrounds through challenging learning…” Source: RevenueBase Database · checked Sep 20, 2026
12	Cornerstone Christian Academy	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	11-50	46 contacts →
	Indirect evidence “The mission of Cornerstone Christian Academy is to educate children, including those from at‑risk neighborhoods, in an environment that provides the highest standards for academic…” Source: RevenueBase Database · checked Sep 20, 2026
13	Communities In Schools Of Philadelphia, INC	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	501-1,000	41 contacts →
	Partial evidence “At Communities In Schools, everything we do is guided by the “Five Basics.” Developed by our founder Bill Milliken, the Five Basics are a set of essentials that every child needs…” Source: RevenueBase Database · checked Sep 20, 2026
14	Microsociety	Indirect evidence	Philadelphia, United StatesHQ checked Sep 20, 2026	n/a	38 contacts →
	Indirect evidence “MicroSociety Inc.(MSI) is a 501(c)(3) nonprofit organization dedicated to transforming education through immersive, real-world learning experiences.” Source: RevenueBase Database · checked Sep 20, 2026
15	Scholar Academies	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	501-1,000	33 contacts →
	Partial evidence “Scholar Academies transforms low-performing schools so every child has the knowledge and character to pursue the path to college and opportunities beyond.” Source: RevenueBase Database · checked Sep 20, 2026
16	Children's Village	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	51-200	23 contacts →
	Indirect evidence “Founded in 1976, Children’s Village is committed to the highest standard of educational excellence for every child, embracing best practice and engaging families as partners in…” Source: RevenueBase Database · checked Sep 20, 2026
17	The Aspen Grove School	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	11-50	21 contacts →
	Partial evidence “The Aspen Grove School is a company based out of 1600 Christian St, Philadelphia, Pennsylvania, United States.” Source: RevenueBase Database · checked Sep 20, 2026
18	Philadelphia Academy CS	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	11-50	20 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
19	BIG Picture Philadelphia	Strong evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	51-200	18 contacts →
	Strong evidence “Big Picture Philadelphia (BPP) provides a progressive, project-based, real world education to more than 400 students at two Philadelphia public high schools.” Source: RevenueBase Database · checked Sep 20, 2026
20	Hope Partnership For Education	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	11-50	9 contacts →
	Partial evidence “Hope Partnership for Education is a North Philadelphia independent middle school and education center that provides a high quality, values-based education that supports and…” Source: RevenueBase Database · checked Sep 20, 2026
21	Quadrat Academy	Strong evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	51-200	6 contacts →
	Strong evidence “Quadrat Academy is a progressive education Secondary School for ages 11-18.” Source: RevenueBase Database · checked Sep 20, 2026
22	Need In Deed	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	1-10	6 contacts →
	Partial evidence “Believing that every child has the right to a high-quality education, Need in Deed seeks to improve the educational outcomes and experiences of Philadelphia's public school…” Source: RevenueBase Database · checked Sep 20, 2026
23	Maritime Charter High School	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	11-50	6 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
24	CB Community Schools	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	51-200	4 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
25	Philly Free School	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	11-50	3 contacts →
	Partial evidence “At the Philly Free School students ages 4-19 explore freely, think critically, and work collaboratively, across ages, to govern themselves and their school.” Source: RevenueBase Database · checked Sep 20, 2026

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: progressive schools. 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 progressive schools.
Partial evidence: Its own public description names part of progressive schools, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name progressive schools. 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 43 progressive schools based in Philadelphia, United States

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Progressive schools based in Philadelphia, United States at a glance

As of Sep 20, 2026

52.7%Verified-email coverage

62.0Average contacts per company

11-50Median size (employees)

295.3%Largest-city concentration · New York

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Philadelphia, so it is reported there. Company counts and contact totals on this page are exact for Philadelphia, over 43 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 progressive schools, 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 Philadelphia, United States whose own description of what they do matches “progressive schools”. 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 progressive schools), 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 progressive schools, and records with no verified work email. Companies headquartered outside Philadelphia 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, 1,405 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.

Progressive schools by metro in the United States

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 progressive schools, 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 progressive schools are there based in Philadelphia, United States?

RevenueBase identified 43 progressive schools headquartered in Philadelphia, 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?

Mastery Schools, headquartered in Philadelphia, tops this list with the largest team on record.

Which city has the most progressive schools?

New York leads with 127 headquartered companies, followed by Chicago (64) and Los Angeles (48).

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 1,405 verified decision-maker contacts tracked across these 43 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.