Company lists · Data refreshed September 2026

Top 25 Heritage preservation organizations based in the United States

Name: Heritage preservation organizations based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 321 companies tracked

RevenueBase identified 321 heritage preservation organizations headquartered in the United States as of September 2026 and tracks 3,319 professional contacts across them, including 1,256 with verified work emails. Washington is the largest hub.

This list covers heritage preservation organizations headquartered in the 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

321Companies

3,319Contacts tracked

1,256Verified emails

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The 25 largest heritage preservation organizations based in the United States

Ranked by team size

Top 25 of 321 heritage preservation organizations based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to heritage preservation organizations: 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	The Trustees Of Reservations	Indirect evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	201-500	463 contacts →
	Indirect evidence “Founded by landscape architect Charles Eliot in 1891, The Trustees has, for more than 125 years, been a catalyst for important ideas, endeavors, and progress in Massachusetts.” Source: RevenueBase Database · checked Sep 20, 2026
2	National Trust For Historic Preservation	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	201-500	338 contacts →
	Partial evidence “For more than 75 years, the National Trust for Historic Preservation has led the movement to safeguard America’s historic places.” Source: RevenueBase Database · checked Sep 20, 2026
3	Historic NEW England	Partial evidence	Haverhill, MA, United StatesHQ checked Sep 20, 2026	51-200	221 contacts →
	Partial evidence “Historic New England is the oldest and largest regional heritage organization in the nation.” Source: RevenueBase Database · checked Sep 20, 2026
4	Historic Charleston Foundation	Indirect evidence	Charleston, SC, United StatesHQ checked Sep 20, 2026	51-200	68 contacts →
	Indirect evidence “Established in 1947, Historic Charleston Foundation is dedicated to preserving and protecting the architectural, historical and cultural character of Charleston and its Lowcountry…” Source: RevenueBase Database · checked Sep 20, 2026
5	Historic Hudson Valley	Indirect evidence	Tarrytown, NY, United StatesHQ checked Sep 20, 2026	51-200	61 contacts →
	Indirect evidence “Historic Hudson Valley, Westchester County’s largest cultural organization, educates and entertains more than visitors a year through school programs, tours of five National…” Source: RevenueBase Database · checked Sep 20, 2026
6	Preservation Virginia	Partial evidence	Richmond, VA, United StatesHQ checked Sep 20, 2026	51-200	57 contacts →
	Partial evidence “Since 1889, Preservation Virginia has preserved historic places and raised awareness of the importance of perpetuating and revitalizing Virginia's cultural, architectural and…” Source: RevenueBase Database · checked Sep 20, 2026
7	Historic Annapolis, INC	Partial evidence	Annapolis, MD, United StatesHQ checked Sep 20, 2026	11-50	47 contacts →
	Partial evidence “Established in 1952, Historic Annapolis is the leading nonprofit preservation and history organization in Annapolis, MD.” Source: RevenueBase Database · checked Sep 20, 2026
8	Indiana Landmarks	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 20, 2026	11-50	42 contacts →
	Indirect evidence “A private nonprofit supported by a diverse membership base and guided by a volunteer board, Indiana Landmarks revitalizes communities, strengthens connections to our diverse…” Source: RevenueBase Database · checked Sep 20, 2026
9	Renaissance Historic Exteriors	Indirect evidence	Belvidere, IL, United StatesHQ checked Sep 20, 2026	51-200	39 contacts →
	Indirect evidence “A nationally recognized leader in the field of historical building restoration since 1992, we construct custom restoration solutions for historical homes, churches, universities…” Source: RevenueBase Database · checked Sep 20, 2026
10	Rempart	Indirect evidence	Paris, United StatesHQ checked Sep 20, 2026	n/a	39 contacts →
	Indirect evidence “REMPART est une union d'associations qui œuvrent à la restauration et la préservation du patrimoine.” Source: RevenueBase Database · checked Sep 20, 2026
11	Historic Columbia	Indirect evidence	Columbia, SC, United StatesHQ checked Sep 20, 2026	11-50	30 contacts →
	Indirect evidence “In November 1961, a small group of individuals intent on saving the Ainsley Hall House from demolition officially incorporated as the Historic Columbia.” Source: RevenueBase Database · checked Sep 20, 2026
12	The Historic Trust	Partial evidence	Vancouver, WA, United StatesHQ checked Sep 20, 2026	11-50	27 contacts →
	Partial evidence “linktr.ee/thehistorictrust Mission:To inspire civic pride through education, preservation and celebration of our community’s history.” Source: RevenueBase Database · checked Sep 20, 2026
13	Building Conservation Associates, INC	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	11-50	25 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
14	Heritage Consulting Group	Strong evidence	Philadelphia, PA, United StatesHQ checked Sep 20, 2026	11-50	25 contacts →
	Strong evidence “Heritage Consulting Group is a national historic preservation consulting firm specializing in historic tax credits, advising owners and developers of historic buildings through…” Source: RevenueBase Database · checked Sep 20, 2026
15	Historicorps	Indirect evidence	Morrison, CO, United StatesHQ checked Sep 20, 2026	11-50	25 contacts →
	Indirect evidence “HistoriCorps is a 501(c)(3) nonprofit that provides volunteers of all skill levels with a hands-on experience preserving historic structures on public lands across America.” Source: RevenueBase Database · checked Sep 20, 2026
16	Landmarks Illinois	Partial evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	1-10	24 contacts →
	Partial evidence “Founded in 1971, Landmarks Illinois is the state’s leading voice for historic preservation.” Source: RevenueBase Database · checked Sep 20, 2026
17	The National Society Of The Colonial Dames Of America	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	22 contacts →
	Indirect evidence “The National Society of The Colonial Dames of America promotes appreciation for the people, places and events that led to the formation and development of our country.” Source: RevenueBase Database · checked Sep 20, 2026
18	LOS Angeles Conservancy	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “The Los Angeles Conservancy is a private, member-based nonprofit devoted to preserving, revitalizing, and celebrating the historic places that make Greater Los Angeles unique.” Source: RevenueBase Database · checked Sep 20, 2026
19	John G. Waite Associates, Architects Pllc	Indirect evidence	Albany, NY, United StatesHQ checked Sep 20, 2026	11-50	19 contacts →
	Indirect evidence “John G.” Source: RevenueBase Database · checked Sep 20, 2026
20	The Georgia Trust For Historic Preservation	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 20, 2026	11-50	18 contacts →
	Partial evidence “The mission of The Georgia Trust for Historic Preservation is to work for the preservation and revitalization of Georgia's diverse historic resources and advocate their…” Source: RevenueBase Database · checked Sep 20, 2026
21	The NEW York Landmarks Conservancy	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	11-50	17 contacts →
	Indirect evidence “The New York Landmarks Conservancy is dedicated to celebrating, preserving, and protecting the iconic buildings and unique neighborhoods that help define our vibrant and…” Source: RevenueBase Database · checked Sep 20, 2026
22	Preservation Maryland	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 20, 2026	11-50	17 contacts →
	Partial evidence “Since 1931, Preservation Maryland has worked to protect the historic places, stories, and communities in Maryland that matter.” Source: RevenueBase Database · checked Sep 20, 2026
23	Historic Denver	Indirect evidence	Denver, CO, United StatesHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “Historic Denver, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
24	Pasadena Heritage	Strong evidence	Pasadena, CA, United StatesHQ checked Sep 20, 2026	1-10	16 contacts →
	Strong evidence “Pasadena Heritage is a nonprofit historic preservation organization, founded in 1977 and dedicated to preserving Pasadena's historic resources through educational programs and…” Source: RevenueBase Database · checked Sep 20, 2026
25	The Archaeological Conservancy	Indirect evidence	Albuquerque, NM, United StatesHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “The Archaeological Conservancy, established in 1980, is the only national non-profit organization dedicated to acquiring and preserving the best of our nation's remaining…” 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: heritage preservation 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 heritage preservation organizations.
Partial evidence: Its own public description names part of heritage preservation organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name heritage preservation 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 321 heritage preservation organizations based in the United States

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Heritage preservation organizations based in the United States at a glance

As of Sep 20, 2026

37.8%Verified-email coverage

10.3Average contacts per company

1-10Median size (employees)

5.3%Largest-city concentration · Washington

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

236

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 321 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 heritage preservation 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 the United States whose own description of what they do matches “heritage preservation 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 heritage preservation 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 heritage preservation organizations, and records with no verified work email. Companies headquartered outside United States 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, 1,256 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.

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 heritage preservation 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 heritage preservation organizations are there based in the United States?

RevenueBase identified 321 heritage preservation organizations headquartered in the 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?

The Trustees Of Reservations, headquartered in Boston, tops this list with the largest team on record.

Which city has the most heritage preservation organizations?

Washington leads with 17 headquartered companies, followed by New York (10) and Austin (8).

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 1,256 verified decision-maker contacts tracked across these 321 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.