Company lists · Data refreshed September 2026

Top 25 Engine optimization companies based in the United States

Name: Engine optimization companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 6,224 companies tracked

RevenueBase identified 6,224 engine optimization companies headquartered in the United States as of September 2026 and tracks 67,841 professional contacts across them, including 6,566 with verified work emails. New York is the largest hub.

This list covers engine optimization companies 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 21, 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 21, 2026 86% judged on-target in blind review

6,224Companies

67,841Contacts tracked

6,566Verified emails

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The 25 largest engine optimization companies based in the United States

Ranked by team size

Top 25 of 6,224 engine optimization companies based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to engine optimization companies: 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	SEO INC	Indirect evidence	Carlsbad, CA, United StatesHQ checked Sep 21, 2026	n/a	825 contacts →
	Indirect evidence “Since its inception in 1997, SEO Inc.” Source: RevenueBase Database · checked Sep 21, 2026
2	Wildnet Technologies	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	590 contacts →
	Indirect evidence “Wildnet Technologies - Best Digital Marketing Agency \| White Label Services for Growing Agencies \| Results-Driven AI SEO Services We don't just run campaigns-we build growth…” Source: RevenueBase Database · checked Sep 21, 2026
3	KPL Tech Solution Pvt. LTD	Indirect evidence	Middletown, DE, United StatesHQ checked Sep 21, 2026	201-500	390 contacts →
	Indirect evidence “Do you want to see your business on heights?” Source: RevenueBase Database · checked Sep 21, 2026
4	Boostability	Indirect evidence	Lehi, UT, United StatesHQ checked Sep 21, 2026	201-500	326 contacts →
	Indirect evidence “At Boostability, we're more than just an SEO company; we're your strategic partner in driving online growth.” Source: RevenueBase Database · checked Sep 21, 2026
5	Coalition Technologies	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 21, 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 21, 2026
6	Internet Marketing Inc. NOW REQ	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	51-200	203 contacts →
	Indirect evidence “IMI (now REQ) is a full-service digital marketing agency focused on omnichannel strategies and results.” Source: RevenueBase Database · checked Sep 21, 2026
7	Click Here Digital	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 21, 2026	51-200	167 contacts →
	Indirect evidence “Founded by Bo White in 1993 during the early stages of the Internet, Click Here Digital is a digital marketing and consulting firm that provides full-service digital marketing…” Source: RevenueBase Database · checked Sep 21, 2026
8	GO Local Interactive	Indirect evidence	Overland Park, KS, United StatesHQ checked Sep 21, 2026	51-200	150 contacts →
	Indirect evidence “Go Local Interactive is a premium digital marketing agency specializing in SEO, PPC, Content, and Web products.” Source: RevenueBase Database · checked Sep 21, 2026
9	GPO	Indirect evidence	Austin, TX, United StatesHQ checked Sep 21, 2026	11-50	149 contacts →
	Indirect evidence “GPO is everything search.” Source: RevenueBase Database · checked Sep 21, 2026
10	Dealeron	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 21, 2026	201-500	129 contacts →
	Indirect evidence “DealerOn has been the perfect partner for over dealers across North America.” Source: RevenueBase Database · checked Sep 21, 2026
11	Mainstreethost	Strong evidence	Amherst, NY, United StatesHQ checked Sep 21, 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 21, 2026
12	Search Engine Journal	Indirect evidence	Boca Raton, FL, United StatesHQ checked Sep 21, 2026	11-50	122 contacts →
	Indirect evidence “We are SEO professionals, content writers, and marketers, just like you.” Source: RevenueBase Database · checked Sep 21, 2026
13	SEOP	Strong evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	51-200	121 contacts →
	Strong evidence “SEOP is one of the leaders in the Search Engine Optimization industry and was co-founded by SEO experts that thrive on a combination of in-depth expertise and creative, forward…” Source: RevenueBase Database · checked Sep 21, 2026
14	Local Splash	Partial evidence	Fountain Valley, CA, United StatesHQ checked Sep 21, 2026	51-200	119 contacts →
	Partial evidence “Local Splash is the leading local SEO service that specializes in getting our clients high rankings in local search engine results.” Source: RevenueBase Database · checked Sep 21, 2026
15	Hennessey Digital	Indirect evidence	North Hollywood, CA, United StatesHQ checked Sep 21, 2026	51-200	115 contacts →
	Indirect evidence “Named to Fortune’s 50 Best Workplaces in Advertising & Marketing, Hennessey Digital is an award-winning digital marketing agency specializing in SEO for lawyers and other online…” Source: RevenueBase Database · checked Sep 21, 2026
16	CGS Infotech Solutions	Indirect evidence	Tampa, FL, United StatesHQ checked Sep 21, 2026	501-1,000	115 contacts →
	Indirect evidence “CGS Infotech is a global Information Technology & Media company serving over thousand customers in 40 countries since 1995.” Source: RevenueBase Database · checked Sep 21, 2026
17	compose.ly	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	11-50	115 contacts →
	Indirect evidence “Compose.ly is a content marketing and seo agency that helps brands like WebMD, Calendly, Money.com, TED, and Get Your Guide turn organic content into measurable growth across…” Source: RevenueBase Database · checked Sep 21, 2026
18	Zoek Marketing	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	201-500	108 contacts →
	Indirect evidence “As a business owner there are not many things that make you want to pull your hair out as much as figuring out how to gain new customers, phone calls, and visitors to your website.” Source: RevenueBase Database · checked Sep 21, 2026
19	Seomoz	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	51-200	105 contacts →
	Indirect evidence “SEOmoz is the world’s most popular provider of SEO software.” Source: RevenueBase Database · checked Sep 21, 2026
20	The Digital Battalion	Indirect evidence	Niagara Falls, NY, United StatesHQ checked Sep 21, 2026	11-50	93 contacts →
	Indirect evidence “The Digital Battalion is a provider for SEO and Content Writing Services along with Website development.” Source: RevenueBase Database · checked Sep 21, 2026
21	Digital Resource	Indirect evidence	West Palm Beach, FL, United StatesHQ checked Sep 21, 2026	51-200	90 contacts →
	Indirect evidence “Digital Resource is a full-service internet marketing agency based in South Florida.” Source: RevenueBase Database · checked Sep 21, 2026
22	Direct Online Marketing	Indirect evidence	Pittsburgh, PA, United StatesHQ checked Sep 21, 2026	11-50	89 contacts →
	Indirect evidence “Direct Online Marketing (DOM) is a digital marketing agency and Top 1% Premier Google Partner that has been helping businesses grow confidently online since 2006.” Source: RevenueBase Database · checked Sep 21, 2026
23	Seoprofy	Indirect evidence	Orlando, FL, United StatesHQ checked Sep 21, 2026	51-200	89 contacts →
	Indirect evidence “SeoProfy is your strategic SEO and AI visibility partner for organic and AI visibility that brings real ROI.” Source: RevenueBase Database · checked Sep 21, 2026
24	Paper Street Media	Indirect evidence	Miami, FL, United StatesHQ checked Sep 21, 2026	11-50	88 contacts →
	Indirect evidence “With more than a decade of experience Paper Street Media can help you leverage manpower and increase your capacity for marketing and web design projects.” Source: RevenueBase Database · checked Sep 21, 2026
25	Hawksem	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 21, 2026	51-200	80 contacts →
	Indirect evidence “HawkSEM is a results-driven digital marketing agency with roots in paid search that date back more than a decade.” Source: RevenueBase Database · checked Sep 21, 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: engine optimization companies. 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 engine optimization companies.
Partial evidence: Its own public description names part of engine optimization companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name engine optimization companies. 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 6,224 engine optimization companies based in the United States

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Engine optimization companies based in the United States at a glance

As of Sep 21, 2026

9.7%Verified-email coverage

10.9Average contacts per company

1-10Median size (employees)

3.7%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

4,614

11-50

1,339

51-200

202

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 6,224 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 engine optimization companies, 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 “engine optimization companies”. 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 engine optimization companies), 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 engine optimization companies, 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, 6,566 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 21, 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.

Engine optimization companies 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 engine optimization companies, 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 engine optimization companies are there based in the United States?

RevenueBase identified 6,224 engine optimization companies 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?

SEO INC, headquartered in Carlsbad, tops this list with the largest team on record.

Which city has the most engine optimization companies?

New York leads with 228 headquartered companies, followed by Los Angeles (159) and Houston (115).

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 6,566 verified decision-maker contacts tracked across these 6,224 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 21, 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.