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NIGP, NAICS & UNSPSC Code Lookup

Government and institutional buyers classify what they purchase using three different code systems. Search common NAICS codes below, and jump straight to the right official tool for NIGP or UNSPSC. New to these systems? Read our guide to the differences.

NAICS code search

541511Custom Computer Programming Services
541512Computer Systems Design Services
541519Other Computer Related Services
518210Data Processing, Hosting, and Related Services
541611Administrative Management and General Management Consulting Services
541618Other Management Consulting Services
541330Engineering Services
541310Architectural Services
541990All Other Professional, Scientific, and Technical Services
541810Advertising Agencies
541430Graphic Design Services
561110Office Administrative Services
561210Facilities Support Services
561320Temporary Help Services
561499All Other Business Support Services
561612Security Guards and Patrol Services
561621Security Systems Services (except Locksmiths)
561720Janitorial Services
561730Landscaping Services
562111Solid Waste Collection
236220Commercial and Institutional Building Construction
237310Highway, Street, and Bridge Construction
238210Electrical Contractors and Other Wiring Installation Contractors
238220Plumbing, Heating, and Air-Conditioning Contractors
238990All Other Specialty Trade Contractors
611430Professional and Management Development Training
611710Educational Support Services
621111Offices of Physicians (except Mental Health Specialists)
624410Child Day Care Services
811212Computer and Office Machine Repair and Maintenance
811310Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance
484121General Freight Trucking, Long-Distance, Truckload
488510Freight Transportation Arrangement

Showing 33 of 33 common codes relevant to government and institutional contracting. For the complete official list, see census.gov/naics.

Official NIGP code lookup tools

NIGP Code is licensed content maintained by NIGP (via Periscope Holdings), so it isn’t freely reproducible the way NAICS is. Several state and local agencies publish their own free NIGP search tools for vendors, listed here in one place instead of scattered across dozens of procurement sites:

For background on the code itself, see NIGP’s own overview of the NIGP Code.

UNSPSC codes for UN procurement

If you're registering on UNGM or responding to UN agency tenders, the relevant system is UNSPSC, not NIGP. UNGM publishes its own official UNSPSC reference for suppliers:

UNGM: United Nations Standard Products and Services Code (UNSPSC)

Frequently asked questions

What's the difference between NIGP, NAICS, and UNSPSC codes?

NAICS classifies your industry and drives things like SBA size standards and small-business certifications. NIGP is used mainly by US state and local (SLED) agencies to classify the specific commodities and services they buy. UNSPSC is a UN-maintained taxonomy used in UNGM and international procurement. A single business can hold codes in more than one system at once.

Can I look up official NIGP codes directly on this page?

This page searches a curated set of common NAICS codes directly. NIGP Code is licensed content maintained by NIGP (Periscope Holdings), so for the authoritative NIGP catalog, use one of the official state and city lookup tools linked below rather than an unofficial source.

Which code system do I need to register with?

It depends on who you're selling to. SLED agencies commonly use NIGP (sometimes alongside NAICS), UN agencies use UNSPSC on UNGM, and most SBA and federal programs key off NAICS. Many contractors end up registering codes in more than one system.

Does BidBuster match my codes against RFP requirements automatically?

Yes. Procurement codes referenced in an RFP are extracted during decoding and checked against the codes registered in your Master Profile, with crosswalk support to bridge between systems where a mapping exists.

Stop matching codes by hand for every RFP

BidBuster checks your registered codes against every RFP automatically. See SLED bid software or UNGM tender software.

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