NAICS Code 5611: Office Administrative Services

The NAICS code for Office Administrative Services is 5611.

Office Administrative Services establishments provide comprehensive back-office management on an outsourced basis, including payroll processing, accounts payable, human resources administration, and facilities coordination. These providers allow client firms to reduce fixed overhead and access specialized administrative expertise without hiring internal staff.

Office Administrative Services falls under the NAICS code for NAICS 561 — Administrative and Support Services, a subsector of Administrative and Support and Waste Management and Remediation Services.