Company lists · Data refreshed September 2026

Top 25 HR outsourcing firms based in Seattle, United States

Name: HR outsourcing firms based in Seattle, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 61 companies tracked

RevenueBase identified 61 company matches for HR outsourcing firms associated with Seattle, United States as of September 2026 and tracks 459 professional contacts across them, including 147 with verified work emails. Across the United States, New York is the largest hub for this category (417 companies); Seattle has 61.

This list covers company matches for HR outsourcing firms associated with Seattle, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 30, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 30, 2026 How this list was built

61Companies

459Contacts tracked

147Verified emails

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The 25 largest HR outsourcing firms based in Seattle, United States

Ranked by team size

Top 25 of 61 company matches for HR outsourcing firms based in Seattle, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 30, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	The Institute For Corporate Productivity I4cp	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	51-200	94 contacts →
	Exact match “The Institute for Corporate Productivity (i4cp) is the leading global research and consulting firm dedicated to helping organizations build high-performance organizations.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
2	PAYNW	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	51-200	49 contacts →
	Exact match “At PayNW, we help businesses make sense of payroll and HCM as things get more complex.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
3	Redcley Partners	Exact match	Seattle, United StatesHQ recorded Sep 30, 2026	51-200	29 contacts →
	Exact match “We partner with our Clients to support them across their business with staffing and consulting services, full-time employees, and project based solutions.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
4	Highbrow LLC	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	11-50	28 contacts →
	Exact match “Highbrow LLC" has been founded by professionals having deep industry experience.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
5	Seattle Corporate Search	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	11-50	24 contacts →
	Exact match “As a boutique, woman-owned talent acquisition agency, SCS specializes in building powerhouse teams for everyone from fast-growing startups to established enterprise companies.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
6	Plum Coaching & HR Consulting	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	11-50	20 contacts →
	Exact match “Plum provides a range of HR services, as well as career-related coaching.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
7	Myriad Consulting, INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	11-50	18 contacts →
	Exact match “Myriad Consulting is a leader in providing global workforce solutions.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
8	C9 Staff	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	51-200	16 contacts →
	Exact match “Book a FREE consultation today: https://bit.ly/C9FreeConsultation C9 Staff is your growth partner in expanding your agency’s staff capabilities.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
9	Sojust Solutions	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	11-50	12 contacts →
	Exact match “SoJust Solutions is a majority women-owned and minority-owned business, offering full service staffing and consulting services to organizations of all sizes.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
10	AGG	Exact match	Seattle, United StatesHQ recorded Sep 30, 2026	1-10	10 contacts →
	Exact match “AGG is a husband-wife team operating out of West Seattle with over 25 years’ experience in manufacturing recruiting & marketing and offering job seekers professional services such…” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
11	S Piper Staffing LLC	Exact match	Seattle, United StatesHQ recorded Sep 30, 2026	1-10	7 contacts →
	Exact match “S Piper Staffing is an industry-leading nationwide woman owned minority recruiting firm that identifies talented job seekers whose interests and values align with those of their…” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
12	HR Group International	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	6 contacts →
	Exact match “Human Resources Group International, Inc.(HRGI) is a group of Human Resources consultants with over 25 years of experience in the field providing comprehensive human resources…” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
13	Cloutera	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	5 contacts →
	Exact match “We are HIRING!** Apply with an updated resume and cover letter - Go to our career pages and find out job opportunities: Powered by data, driven by people, and passionate about…” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
14	Emerald Talent	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	11-50	4 contacts →
	Exact match “Emerald Talent is a Tech Recruiting firm specializing in On-Demand, RPO (recruitment process outsourcing), and customized recruiting services.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
15	Cavnesshr	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	4 contacts →
	Exact match “At cavnessHR we deliver HR to companies with 49 or fewer people across the U.S.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
16	Talentlign INC	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	4 contacts →
	Exact match “When it comes to unlocking the full potential of your workforce, one size does not fit all.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
17	Trillium Hiring Services	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	3 contacts →
	Exact match “Delivering Talent Management Strategy, Hiring Process Consulting and Tactical Execution for stage appropriate growth.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
18	Modern Human HR	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	3 contacts →
	Exact match “Modern Human helps people be and do their best for the benefit of innovative Pacific Northwest companies that see HR as a tool for achieving strategic goals.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
19	The Barbelo Group	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	11-50	3 contacts →
	Exact match “The Barbelo Group specializes on the People side of the business.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
20	Hruprise	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	3 contacts →
	Exact match “We support employees with independent HR coaching.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
21	IVY Staffing	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	2 contacts →
	Exact match “Ivy is a staffing firm that focuses on recruiting individuals from underrepresented groups and partnering them with organizations who prioritize flexibility and inclusion in their…” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
22	HR Consultant Solutions, LLC	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	2 contacts →
	Exact match “HR Consultant Solutions, LLC partners with mid to large-sized companies to measurably improve employee and organizational performance while minimizing employment practice risk.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
23	CDS Human Capital Consulting LLC	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	1 contacts →
	Exact match “cDs Human Capital Consulting LLC was founded in 2016 by Carla S Dye, a human resource consulting company located in the Washington DC Metropolitan area focused on emerging…” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
24	Insight Placement Solutions	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	1 contacts →
	Exact match “We have a team with over 10 years in the talent placement industry experienced in providing top shelf consultant resources,solving your most challenging business problems.” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase
25	BIG Wave Recruiting	Exact match	Seattle, WA, United StatesHQ recorded Sep 30, 2026	1-10	1 contacts →
	Exact match “Are you a CEO, CFO, or in HR leadership?” Recorded in the RevenueBase company graph · Sep 30, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “HR outsourcing firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 61 HR outsourcing firms based in Seattle, United States

See the full list, filter by size, metro and specialty, and access 147 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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HR outsourcing firms based in Seattle, United States at a glance

As of Sep 30, 2026

32.0%Verified-email coverage

7.5Average contacts per company

1-10Median size (employees)

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

Email recency for this list is measured across the whole United States list rather than for Seattle, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 61 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Seattle, United States whose business descriptions match “HR outsourcing firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 147 professional contacts with verified work emails across the full matched dataset. 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 30, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

HR outsourcing firms by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “HR outsourcing firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many HR outsourcing firms are there based in Seattle, United States?

RevenueBase identified 61 company matches for HR outsourcing firms associated with Seattle, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

The Institute For Corporate Productivity I4cp tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most HR outsourcing firms?

New York leads the United States with 417 company records, followed by Atlanta (236) and Houston (217). Seattle has 61.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 147 professional contacts with verified work emails tracked across these 61 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 30, 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 SmartSearch, 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.