Top 100 HR Service Providers in the United States

Staffing agency SEEK is based in Grafton, Wis, with other offices in Oshkosh, Cheboygan, and Green Bay, Wis. Since 1971, their team of nearly 300 has been specializing in HR consulting & outsourcing. SEEK works with various industries including business services, finance, and healthcare. 

Sentinel Benefits is a benefits and financial consulting firm based in Wakefield, Mass. with a second office in New York City. Founded in 1987, they have a team of about 220 that provides services to the manufacturing, retail, healthcare, business services, and financial services industries. They specialize in HR consulting and outsourcing services to clients across a variety of industries.

Star Staffing is a staffing agency based in Petaluma, California, that was established in 1998. Their team of 143 offers HR consulting and outsourcing services.

Wattsnext is a human resources company. They focus on HR services and were founded in 2007. Their small team is Coorparoo, Australia-based.

Foundation Recruiting and Consulting is a small HR agency. Established in 2013, the agency is located in San Diego, California. Their services include HR services.

Established in 1998, HR Sources & Solutions is a HR company. The agency specializes in HR services and has a small team. The agency is based in Athens, Tennessee and Cleveland, Tennessee.

Apollo Technical LLC is a staffing agency located in Smyrna, Georgia. Founded in 2010, their team of fewer than 50 serves companies in industries such as IT and manufacturing.

Located in BROOKLYN, New York, On the go HR, Inc is a HR firm. The small team offers HR services and was launched in 2021.

BlueTreeDigital is a full service marketing agency located in Reston, Va. Founded in 2012, BlueTreeDigital's small team of under 5 employees specializes in SEO, web design, and digital strategy.The client appreciated BlueTreeDigital's focus on testing the new website and ability to resolve bugs.

Mathews'​ HR Consulting Services is a human resources agency. The small Oldsmar, Florida-based company was launched in 2018. Their team offers HR services.

Corporate Synergies is an insurance and employee benefits brokerage and consultancy based in Camden, N.J. with offices in New York City, Bethesda, Md., and Orlando, Fla. Founded in 2003, they have a team of about 210 that provides HR consulting and outsourcing services.

HUB International is a network of global insurance brokerage firms headquartered in Chicago, Illinois. Established in 1998 by the merger of 11 privately held firms, HUB currently has over 11,000 employees worldwide. Their services include business insurance for nearly any sector, benefits consulting, risk strategy, and more for a global and well-established client base.

MyPEOAgency is an outsourcing firm based in Lake Worth, Fla. Their small team is comprised of 5 employees. MyPEOAgency specializes in HR consulting and outsourcing, PEO and employee leasing, and HRO. Most of their clients are located in business services or financial sector.

Robert Half is a global specialized staffing firm based in San Francisco with an additional office in New York. Since it was established in 1948, the team has expanded to just over 37,000 employees. Robert Half offers a full range of solutions focused entirely on HR consulting and outsourcing. Their client base features a diverse set of industries.

HR company HR Unlimited, Inc. Was launched in 2001. Their small team is located in Santa Ana, California and provides HR services.

Aerotek is a global recruiting and staffing agency based in Chicago, with other offices in Baltimore, Detroit, and Canada. Since their start in 1983, the company has grown into a team of nearly 20,000 HR consulting and outsourcing specialists.

Adecco is an HR solutions company based in Zurich, Switzerland, with additional offices in the United States, France, Italy, Spain, and India. It was founded in 1996 and currently employs a team of 33,000 specialists who exclusively provide HR consulting and outsourcing services.

Blueprint Apps is a software and staff augmentation company founded in Scottsdale, Ariz. with no more than 10 employees. Since their founding in 2013, they have offered IT staff augmentation, mobile app development, and web development solutions to various clients.

HireLATAM, a Recruiting and Recruitment Process Outsourcing company, is headquartered in Durango, Colorado. The firm specializes in Recruiting and Recruitment Process Outsourcing and has a small team.The firm was founded in 2023.

Teamswell is a finance & accounting outsourcing (FAO) company. They specialize in finance & accounting outsourcing (FAO), web development, accounting, customer service outsourcing, and more and were launched in 2020. The company is based in Truckee, California.

VantagePoint Benefit Administrators is a small insurance services & brokers company. They offer insurance services & brokers, HR services, and financial advising & planning and were established in 1994.

Located in Boston, Massachusetts, Zintro is a midsize market research company. They offer market research, HR services, and business consulting and were established in 2007.

Abel HR is a professional employer organization based in Cranbury, N.J. with offices in New Rochelle, N.Y. and Santa Ana, Calif. Founded in 1992, they have a team of about 30 that exclusively works with those in the financial sector. They specialize in HR consulting and outsourcing services.

Ahead Human Resources is an HR services company based in Louisville, Ky. It was founded in 1995 and now has a team of 23 that provides HR consulting and outsourcing services for clients in the business & financial industries. 

Aon is a professional services firm located in Chicago, with additional offices in New York City and London. With a team of nearly 60,000 employees, the company mainly provides HR consulting and outsourcing services to clients in the healthcare, finance, and entertainment industries.

Kelly Services is a human resources outsourcing firm headquartered in Troy, Mich., with 15 global offices throughout the US, Europe, and Asia. Established in 1946, Kelly Services has grown into a team of over 10,000 employees. Their services revolve entirely around HR consulting and outsourcing. Kelly Services partners with a diverse client base that includes prominent global firms.

CRG | Search Staffing Solutions is a human resources agency. They are in San Jose, Costa Rica and have a midsize team. The firm specializes in HR services, accounting, non-voice bpo/back office services, IT managed services, and more.

Human resources agency Labor Max Staffing is based in Phoenix, Arizona. The midsize team provides HR services and accounting. The agency was founded in 2002.

Chernoff Diamond is a benefits and risk management advisory firm based in Uniondale, NY. Founded in 1980. they have a team of about 100 employees who provide HR consulting and outsourcing services.

Notch is an IT staff augmentation and recruiting company launched in 2019. The small San Francisco, California-based team specializes in IT staff augmentation and recruiting.