Company lists · Data refreshed September 2026
Top 25 Naturalist guide services based in the United States
RevenueBase identified 438 naturalist guide services headquartered in the United States as of September 2026 and tracks 6,267 professional contacts across them, including 2,100 with verified work emails. Jackson is the largest hub.
This list covers naturalist guide services 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.
The 25 largest naturalist guide services based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 795 contacts → | ||||
Indirect evidence “The Student Conservation Association (SCA) is the largest provider of hands-on environmental conservation programs for youth and adults.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 554 contacts → | ||||
Indirect evidence “Mass Audubon is the largest nature-based conservation organization in New England.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 378 contacts → | ||||
Indirect evidence “The mission of the Appalachian Mountain Club is to foster the protection, enjoyment, and understanding of the outdoors.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 188 contacts → | ||||
Indirect evidence “Environmental science in nature’s classroom NatureBridge provides hands-on environmental science programs for young people.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 127 contacts → | ||||
Indirect evidence “Wilderness Inquiry connects people of all ages, backgrounds, identities, and abilities to shared outdoor adventures so that all people can equitably experience the benefits of…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 118 contacts → | ||||
Indirect evidence “Teton Science Schools connects people, place, and nature through education.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 112 contacts → | ||||
Indirect evidence “Leave No Trace is a member-funded 501(c)(3) non-profit organization providing Leave No Trace programs, education, training, and outreach in all 50 states and more than 100…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 91 contacts → | ||||
Indirect evidence “The Mountaineers is a community of outdoor enthusiasts passionate about exploration, discovery, learning, and conservation.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 88 contacts → | ||||
Indirect evidence “At The Wilds, our mission is simple but powerful: Empowering People.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 78 contacts → | ||||
Indirect evidence “Cincinnati Nature Center connects people of all ages with the natural world.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 71 contacts → | ||||
Indirect evidence “The Chattahoochee Nature Center's (CNC) mission is to connect people with nature.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 68 contacts → | ||||
Indirect evidence “ODC Network (ODC) is a 501(c)(3) nonprofit organization based in Holland, Michigan, with a mission to advance outdoor education and conservation throughout West Michigan.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 67 contacts → | ||||
Indirect evidence “We inspire and empower environmental stewardship for all through transformative experiences in nature.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 57 contacts → | ||||
Indirect evidence “Once a farm for the Schlitz Brewery draft horses, Schlitz Audubon Nature Center is Milwaukee’s comprehensive nature center.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 56 contacts → | ||||
Indirect evidence “Kalamazoo Nature Center is an environmental services company based out of Kalamazoo, Michigan.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 54 contacts → | ||||
Partial evidence “At Irvine, we guide learning.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 52 contacts → | ||||
Indirect evidence “The Nature of Learning Sierra Nevada Journeys is a 501(c)3 nonprofit in Northern Nevada and Northern California that delivers innovative outdoor, science-based education programs…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 49 contacts → | ||||
Indirect evidence “Aspen Center for Environmental Studies (ACES) is a non-profit environmental science education center with four sites in the Roaring Fork Valley.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 48 contacts → | ||||
Indirect evidence “The Schuylkill Center for Environmental Education inspires meaningful connections between people and nature.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 46 contacts → | ||||
Indirect evidence “The Houston Arboretum & Nature Center is a non-profit organization with a mission to provide education about the natural environment to people of all ages and to protect and…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 45 contacts → | ||||
Indirect evidence “NorthBay Education is the premier outdoor school in the nation, ready to welcome students for the experience of a lifetime.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 45 contacts → | ||||
Indirect evidence “Wilderness Awareness School, a 501(c)(3) not-for-profit organization founded in 1983, is an internationally-recognized leader in outdoor education.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 42 contacts → | ||||
Indirect evidence “Where nature education, conservation, and science meet.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 42 contacts → | ||||
Indirect evidence “Camp Timber-lee creates life changing camp experience for people of all ages throughout the year.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 42 contacts → | ||||
Indirect evidence “Every child, regardless of race or economic background should have the opportunity to experience the therapeutic benefits of time spent in nature.” 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: naturalist guide services. 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 naturalist guide services.
- Partial evidence
- Its own public description names part of naturalist guide services, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name naturalist guide services. 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 438 naturalist guide services based in the United States
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Naturalist guide services based in the United States at a glance
As of Sep 20, 2026Companies by employee count
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 438 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 naturalist guide services, 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 “naturalist guide services”. 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 naturalist guide services), 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 naturalist guide services, 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, 2,100 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 naturalist guide services, 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 naturalist guide services are there based in the United States?
RevenueBase identified 438 naturalist guide services 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?
Student Conservation Association, headquartered in Arlington, tops this list with the largest team on record.
Which city has the most naturalist guide services?
Jackson leads with 10 headquartered companies, followed by Denver (5) and Eugene (4).
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 2,100 verified decision-maker contacts tracked across these 438 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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