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LAST UPDATED: July 1, 2026

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O Ray Sheets Accountancy Corp

1120 West I Street- Suite A | Los Banos- California- 93635 | 209-826-3503

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Revenue: $1 million - $5 million | Year Founded: 2012 | Firm Size: 10 - 50

Core Services: Payroll Services

O S AccountingTax Services

1237 Albert Street-- Second floor- Suite No. 5- | Regina- Saskatchewan | +1 306-351-5516

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Revenue: $1 million - $3 million | Year Founded: 2016 | Firm Size: 25+

Core Services: Payroll Services

O.I. Group

Stn Main PO Box 4669 | Brantford- Ontario- N3T 6J7 | 800-668-9852

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Revenue: $50 million - $100 million | Year Founded: 2012 | Firm Size: 500 - 1,000

Core Services: Payroll Services

O'Brien Payroll UK Ltd

1 Grosvenor Road- - Manchester | Urmston- England | +44 7951 256510

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Revenue: $3 million - $5 million | Year Founded: 2015 | Firm Size: 20+

Core Services: Payroll Services

O'Connell MeskillCompany

2nd Floor Station House Railway Square- Waterford | Ireland | +353 51 873 985

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Revenue: $3 million - $5 million | Year Founded: 2013 | Firm Size: 20+

Core Services: Payroll Services

O'ConnorO'Connor , P.C.

110 Schiller Street #306- | Elmhurst- Illinois | +1 630-903-6397

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Revenue: $250,000 - $1 million | Year Founded: 2012 | Firm Size: 15+

Core Services: Pre-Employment Screening

O'DonnellCo., LLC

107 West Federal Street Suite 11- | Virginia- United States | +1 540-687-8290

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Revenue: $3 million - $5 million | Year Founded: 2015 | Firm Size: 25+

Core Services: Payroll Services

O'Donovan KeyesCo Chartered Accountants

13 Bridge House- St Patricks Quay- Cork | Ireland | +353 21 462 8188

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Revenue: $250,000 - $1 million | Year Founded: 2014 | Firm Size: 20+

Core Services: Payroll Services

O'Flaherty Law of Elmhurst

110 Schiller Street #220- | Elmhurst- Illinois | +1 331-253-4060

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Revenue: $3 million - $5 million | Year Founded: 2012 | Firm Size: 15+

Core Services: Pre-Employment Screening

O'Kelly Sutton

Scarton House Convent Road- Kildare Town | Ireland | +353 45 530 777

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Revenue: $250,000 - $1 million | Year Founded: 2016 | Firm Size: 10+

Core Services: Payroll Services

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