Company lists · Data refreshed September 2026

Top 25 Animal welfare nonprofits based in the United States

Name: Animal welfare nonprofits based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 2,451 companies tracked

RevenueBase identified 2,451 animal welfare nonprofits headquartered in the United States as of September 2026 and tracks 28,536 professional contacts across them, including 8,619 with verified work emails. New York is the largest hub.

This list covers animal welfare nonprofits 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 19, 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 19, 2026 86% judged on-target in blind review

2,451Companies

28,536Contacts tracked

8,619Verified emails

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The 25 largest animal welfare nonprofits based in the United States

Ranked by team size

Top 25 of 2,451 animal welfare nonprofits based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to animal welfare nonprofits: 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	ASPCA	Strong evidence	New York, NY, United StatesHQ checked Sep 19, 2026	501-1,000	1,315 contacts →
	Strong evidence “The ASPCA (The American Society for the Prevention of Cruelty to Animals) is the first animal welfare organization established in North America and serves as the nation’s leading…” Source: RevenueBase Database · checked Sep 19, 2026
2	Best Friends Animal Society	Strong evidence	Kanab, UT, United StatesHQ checked Sep 19, 2026	501-1,000	956 contacts →
	Strong evidence “Best Friends Animal Society is the leading animal welfare organization working to end the killing of dogs and cats in America’s shelters by 2025.” Source: RevenueBase Database · checked Sep 19, 2026
3	Humane World For Animals	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	501-1,000	873 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
4	PETA	Partial evidence	Norfolk, VA, United StatesHQ checked Sep 19, 2026	201-500	592 contacts →
	Partial evidence “People for the Ethical Treatment of Animals (PETA) entities have more than 10.4 million members and supporters globally, and PETA U.S.” Source: RevenueBase Database · checked Sep 19, 2026
5	Mspca-Angell	Strong evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	201-500	502 contacts →
	Strong evidence “The mission of the Massachusetts Society for the Prevention of Cruelty to Animals is to protect animals, relieve their suffering, advance their health and welfare, prevent…” Source: RevenueBase Database · checked Sep 19, 2026
6	Animal Humane Society	Partial evidence	Golden Valley, MN, United StatesHQ checked Sep 19, 2026	201-500	472 contacts →
	Partial evidence “Every year, Animal Humane Society provides direct care and services to help more than animals in need across Minnesota.” Source: RevenueBase Database · checked Sep 19, 2026
7	SAN Diego Humane Society	Strong evidence	San Diego, CA, United StatesHQ checked Sep 19, 2026	501-1,000	434 contacts →
	Strong evidence “San Diego Humane Society, an open-admission shelter, is creating a more humane world by inspiring compassion and advancing the welfare of animals and people.” Source: RevenueBase Database · checked Sep 19, 2026
8	SAN Francisco Spca	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	201-500	270 contacts →
	Partial evidence “At the San Francisco SPCA we envision a world in which the love people share with animals uplifts humanity to a state of greater compassion.” Source: RevenueBase Database · checked Sep 19, 2026
9	Oregon Humane	Indirect evidence	Portland, OR, United StatesHQ checked Sep 19, 2026	201-500	227 contacts →
	Indirect evidence “Over the past 150+ years, we’ve been busy!” Source: RevenueBase Database · checked Sep 19, 2026
10	Paws Chicago	Strong evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	51-200	225 contacts →
	Strong evidence “PAWS Chicago is one of the nation’s largest comprehensive No Kill animal welfare organizations, building innovative programs to end the killing of homeless pets.” Source: RevenueBase Database · checked Sep 19, 2026
11	Mercy For Animals	Partial evidence	West Hollywood, CA, United StatesHQ checked Sep 19, 2026	51-200	202 contacts →
	Partial evidence “Mercy For Animals believes that a humane society is possible.” Source: RevenueBase Database · checked Sep 19, 2026
12	Spca Of Texas	Strong evidence	Dallas, TX, United StatesHQ checked Sep 19, 2026	51-200	175 contacts →
	Strong evidence “Founded in 1938, the SPCA of Texas is a 501(c)(3) non-profit animal welfare organization that operates one shelter, one spay/neuter clinic, one mobile adoptions vehicle and an…” Source: RevenueBase Database · checked Sep 19, 2026
13	North Shore Animal League America	Partial evidence	Port Washington, NY, United StatesHQ checked Sep 19, 2026	201-500	174 contacts →
	Partial evidence “Since 1944, North Shore Animal League America has been saving the lives of innocent dogs, cats, puppies, and kittens, over to date.” Source: RevenueBase Database · checked Sep 19, 2026
14	Wisconsin Humane Society	Partial evidence	Milwaukee, WI, United StatesHQ checked Sep 19, 2026	201-500	153 contacts →
	Partial evidence “Founded in 1879, the Wisconsin Humane Society has been saving the lives of animals in need for nearly 140 years.” Source: RevenueBase Database · checked Sep 19, 2026
15	Helen Woodward Animal Center	Partial evidence	Rancho Santa Fe, CA, United StatesHQ checked Sep 19, 2026	51-200	150 contacts →
	Partial evidence “Helen Woodward Animal Center is a unique, private, non-profit organization in San Diego County that, for over 50 years, has been committed to the philosophy of people helping…” Source: RevenueBase Database · checked Sep 19, 2026
16	Lifeline Animal Project	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 19, 2026	201-500	150 contacts →
	Partial evidence “At LifeLine Animal Project, we don’t just run shelters, we’re saving lives.” Source: RevenueBase Database · checked Sep 19, 2026
17	Humane Society Of The Pikes Peak Region	Strong evidence	Colorado Springs, CO, United StatesHQ checked Sep 19, 2026	201-500	148 contacts →
	Strong evidence “Founded in 1949, the Humane Society of the Pikes Peak Region (HSPPR) is a public 501 (c) 3 nonprofit animal welfare organization dedicated to the care and protection of…” Source: RevenueBase Database · checked Sep 19, 2026
18	Humane Society Silicon Valley	Partial evidence	Milpitas, CA, United StatesHQ checked Sep 19, 2026	51-200	146 contacts →
	Partial evidence “Humane Society Silicon Valley (HSSV) is an independent, 501(c)(3) non-profit animal shelter that has been serving people and pets since 1929.” Source: RevenueBase Database · checked Sep 19, 2026
19	The Humane League	Strong evidence	New York, NY, United StatesHQ checked Sep 19, 2026	51-200	145 contacts →
	Strong evidence “The Humane League is an global nonprofit ending the abuse of animals raised for food.” Source: RevenueBase Database · checked Sep 19, 2026
20	Atlanta Humane Society	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 19, 2026	51-200	136 contacts →
	Indirect evidence “The Atlanta Humane Society is a no-kill shelter providing sheltering and adoption, veterinary care, and community outreach.” Source: RevenueBase Database · checked Sep 19, 2026
21	Humane Rescue Alliance	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	135 contacts →
	Partial evidence “The Washington Humane Society and the Washington Animal Rescue League have each served the animals and people of the District of Columbia and the National Capitol region for over…” Source: RevenueBase Database · checked Sep 19, 2026
22	American Humane Society	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	134 contacts →
	Partial evidence “Since our founding nearly 150 years ago, American Humane Society has served as a beacon for all those who cherish the human-animal bond.” Source: RevenueBase Database · checked Sep 19, 2026
23	Animal Legal Defense Fund	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	133 contacts →
	Partial evidence “Founded in 1979 by attorneys active in shaping the emerging field of animal law, the Animal Legal Defense Fund blazes the trail for stronger enforcement of anti-cruelty laws and…” Source: RevenueBase Database · checked Sep 19, 2026
24	Peninsula Humane Society & Spca	Strong evidence	Burlingame, CA, United StatesHQ checked Sep 19, 2026	51-200	132 contacts →
	Strong evidence “Peninsula Humane Society & SPCA is a private, open-door, not-for-profit animal welfare organization.” Source: RevenueBase Database · checked Sep 19, 2026
25	Dovelewis Veterinary Emergency & Specialty Hospital	Partial evidence	Portland, OR, United StatesHQ checked Sep 19, 2026	201-500	129 contacts →
	Partial evidence “DoveLewis Veterinary Emergency and Specialty Hospital, established in 1973 and based in Portland, Oregon, is the only nonprofit, 24-hour emergency and intensive care unit in the…” Source: RevenueBase Database · checked Sep 19, 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: animal welfare nonprofits. 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 animal welfare nonprofits.
Partial evidence: Its own public description names part of animal welfare nonprofits, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name animal welfare nonprofits. 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 2,451 animal welfare nonprofits based in the United States

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Animal welfare nonprofits based in the United States at a glance

As of Sep 19, 2026

30.2%Verified-email coverage

11.6Average contacts per company

1-10Median size (employees)

1.7%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

1,483

11-50

689

51-200

226

201-500

501-1,000

1,001-5,000

10001+

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 2,451 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 animal welfare nonprofits, 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 “animal welfare nonprofits”. 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 animal welfare nonprofits), 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 animal welfare nonprofits, 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, 8,619 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 19, 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.

Animal welfare nonprofits by metro

Animal welfare nonprofits in New York42
Animal welfare nonprofits in Los Angeles32

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 animal welfare nonprofits, 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 animal welfare nonprofits are there based in the United States?

RevenueBase identified 2,451 animal welfare nonprofits 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?

ASPCA, headquartered in New York, tops this list with the largest team on record.

Which city has the most animal welfare nonprofits?

New York leads with 42 headquartered companies, followed by Los Angeles (32) and Washington (22).

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 8,619 verified decision-maker contacts tracked across these 2,451 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 19, 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.