Company lists · Data refreshed September 2026

Top 25 Email marketing optimization agencies based in the United States

Name: Email marketing optimization agencies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 4,151 companies tracked

RevenueBase identified 4,151 email marketing optimization agencies headquartered in the United States as of September 2026 and tracks 35,316 professional contacts across them, including 11,994 with verified work emails. New York is the largest hub.

This list covers email marketing optimization agencies 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 28, 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 28, 2026 86% judged on-target in blind review

4,151Companies

35,316Contacts tracked

11,994Verified emails

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The 25 largest email marketing optimization agencies based in the United States

Ranked by team size

Top 25 of 4,151 email marketing optimization agencies based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to email marketing optimization agencies: 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	Kinesso	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	5,001-10,000	2,860 contacts →
	Partial evidence “KINESSO is the technology-driven performance marketing agency within Omnicom Media that provides actionable growth for both agency partners and clients.” Source: RevenueBase Database · checked Sep 28, 2026
2	Intuit Mailchimp	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,483 contacts →
	Partial evidence “The Mailchimpossibilities are endless when you create, automate, and optimize your marketing with Mailchimp.” Source: RevenueBase Database · checked Sep 28, 2026
3	WEBFX	Partial evidence	Harrisburg, PA, United StatesHQ checked Sep 28, 2026	501-1,000	866 contacts →
	Partial evidence “We're here to be your digital marketing growth partner in the AI era.” Source: RevenueBase Database · checked Sep 28, 2026
4	NP Digital	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	866 contacts →
	Indirect evidence “Neil Patel has been recognized by the Wall Street Journal, Forbes, and the United Nations, to name a few, as one of the most influential and successful marketers and entrepreneurs…” Source: RevenueBase Database · checked Sep 28, 2026
5	Iquanti	Partial evidence	Jersey City, NJ, United StatesHQ checked Sep 28, 2026	501-1,000	538 contacts →
	Partial evidence “iQuanti was founded to deliver on the promise of high-performance digital marketing, combining deep analytics, proprietary technology, and a results-driven approach.” Source: RevenueBase Database · checked Sep 28, 2026
6	Amsive	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	501-1,000	488 contacts →
	Partial evidence “Amsive is a data-driven performance marketing agency that enhances marketing ROI through innovative customer acquisition and engagement solutions.” Source: RevenueBase Database · checked Sep 28, 2026
7	Sg360	Indirect evidence	Wheeling, IL, United StatesHQ checked Sep 28, 2026	501-1,000	477 contacts →
	Indirect evidence “sg360° can help you identify and connect with your best prospects 1:1, both offline and on.” Source: RevenueBase Database · checked Sep 28, 2026
8	Acadia	Strong evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	201-500	340 contacts →
	Strong evidence “We are a trusted growth marketing agency that brings together scarce skills in the area of CRO (conversion rate optimization), Paid Media (Search, Performance, Video, Audio…” Source: RevenueBase Database · checked Sep 28, 2026
9	Coalition Technologies	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 28, 2026	201-500	320 contacts →
	Indirect evidence “Coalition Technologies is one of the leading SEO & web design agencies in the United States.” Source: RevenueBase Database · checked Sep 28, 2026
10	Targetbase	Partial evidence	Irving, TX, United StatesHQ checked Sep 28, 2026	201-500	315 contacts →
	Partial evidence “Targetbase is a precision marketing agency obsessed with performance-our clients’ and our own.” Source: RevenueBase Database · checked Sep 28, 2026
11	Pacific	Partial evidence	San Diego, CA, United StatesHQ checked Sep 28, 2026	51-200	308 contacts →
	Partial evidence “We are a global growth marketing agency specializing in supporting enterprise brands, like Expedia, Petco, CVS, Square, Realtor, and more.” Source: RevenueBase Database · checked Sep 28, 2026
12	Listrak	Partial evidence	Lititz, PA, United StatesHQ checked Sep 28, 2026	201-500	295 contacts →
	Partial evidence “Listrak is the person-first marketing automation platform that seamlessly integrates data, identity, and cross-channel messaging to power hyper-personalized customer experiences.” Source: RevenueBase Database · checked Sep 28, 2026
13	Intero Digital	Partial evidence	Colorado Springs, UT, United StatesHQ checked Sep 28, 2026	201-500	268 contacts →
	Partial evidence “Intero Digital is a leading digital marketing agency with offices across the USA.” Source: RevenueBase Database · checked Sep 28, 2026
14	Outerbox	Indirect evidence	Akron, OH, United StatesHQ checked Sep 28, 2026	201-500	254 contacts →
	Indirect evidence “At OuterBox, we believe growth is oxygen.” Source: RevenueBase Database · checked Sep 28, 2026
15	Coozmoo Digital. Solutions	Partial evidence	Pearland, TX, United StatesHQ checked Sep 28, 2026	201-500	234 contacts →
	Partial evidence “Coozmoo is a Houston-based, AI-powered digital marketing agency with 250+ specialists, 7 years of proven performance, and one goal: your revenue growth.$280M+ in client revenue…” Source: RevenueBase Database · checked Sep 28, 2026
16	TPG	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 28, 2026	n/a	212 contacts →
	Partial evidence “TPG Direct We are experts in multi-channel customer acquisition who help our clients make complex targeting decisions, optimize marketing investment and generate profitable growth.” Source: RevenueBase Database · checked Sep 28, 2026
17	Tangence	Partial evidence	San Jose, CA, United StatesHQ checked Sep 28, 2026	201-500	205 contacts →
	Partial evidence “Tangence accelerates marketing execution for companies more efficiently than in-house teams or other agencies.” Source: RevenueBase Database · checked Sep 28, 2026
18	Internet Marketing Inc. NOW REQ	Partial evidence	San Diego, CA, United StatesHQ checked Sep 28, 2026	51-200	203 contacts →
	Partial evidence “IMI (now REQ) is a full-service digital marketing agency focused on omnichannel strategies and results.” Source: RevenueBase Database · checked Sep 28, 2026
19	CUBE	Indirect evidence	Palo Alto, CA, United StatesHQ checked Sep 28, 2026	51-200	172 contacts →
	Indirect evidence “Designed for growth-focused teams, Cube helps you acquire new customers and retain loyal ones through real-time intelligent automation, competitive tracking, and expert-led…” Source: RevenueBase Database · checked Sep 28, 2026
20	Stirista	Partial evidence	San Antonio, TX, United StatesHQ checked Sep 28, 2026	51-200	163 contacts →
	Partial evidence “Stirista is the only company that combines data, email, and digital execution to help clients acquire and retain customers by creating a data-driven, repeatable, and scalable…” Source: RevenueBase Database · checked Sep 28, 2026
21	BAD Marketing	Partial evidence	Alpharetta, GA, United StatesHQ checked Sep 28, 2026	51-200	157 contacts →
	Partial evidence “BAD Marketing is a digital marketing firm dedicated to scaling our client's brands through unique marketing strategies.” Source: RevenueBase Database · checked Sep 28, 2026
22	What IF Media Group	Partial evidence	Fort Lee, NJ, United StatesHQ checked Sep 28, 2026	51-200	153 contacts →
	Partial evidence “What If Media Group is an award-winning performance marketing company that enables the world’s leading brands to acquire valuable new customers at scale.” Source: RevenueBase Database · checked Sep 28, 2026
23	Galactic FED Digital Marketing Agency	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	137 contacts →
	Partial evidence “Galactic Fed is a full-service digital marketing agency focused on one thing: HELPING BUSINESSES GROW THEIR REVENUE.” Source: RevenueBase Database · checked Sep 28, 2026
24	Icontact	Indirect evidence	Morrisville, NC, United StatesHQ checked Sep 28, 2026	51-200	137 contacts →
	Indirect evidence “We believe powerful connections propel business growth.” Source: RevenueBase Database · checked Sep 28, 2026
25	Mainstreethost	Strong evidence	Amherst, NY, United StatesHQ checked Sep 28, 2026	51-200	128 contacts →
	Strong evidence “Mainstreethost specializes in everything you need to have a successful online presence, including search engine optimization, paid search marketing, website design, social media…” Source: RevenueBase Database · checked Sep 28, 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: email marketing optimization agencies. 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 email marketing optimization agencies.
Partial evidence: Its own public description names part of email marketing optimization agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name email marketing optimization agencies. 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 4,151 email marketing optimization agencies based in the United States

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Email marketing optimization agencies based in the United States at a glance

As of Sep 28, 2026

34.0%Verified-email coverage

8.5Average contacts per company

1-10Median size (employees)

5.4%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

2,847

11-50

1,043

51-200

192

201-500

501-1,000

1,001-5,000

5,001-10,000

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 4,151 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 email marketing optimization agencies, 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 “email marketing optimization agencies”. 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 email marketing optimization agencies), 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 email marketing optimization agencies, 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, 11,994 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 28, 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.

Email marketing optimization agencies by metro

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 email marketing optimization agencies, 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 email marketing optimization agencies are there based in the United States?

RevenueBase identified 4,151 email marketing optimization agencies 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?

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

Which city has the most email marketing optimization agencies?

New York leads with 225 headquartered companies, followed by Los Angeles (132) and Austin (92).

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 11,994 verified decision-maker contacts tracked across these 4,151 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 28, 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.