Managed Service Providers List: No Code, No Register, No Count

There is no official managed service providers list, and there cannot be one, because MSPs have no classification in federal statistics. The two nearest codes bracket the market from either side: one counts 179,245 establishments and is far too broad, the other counts 6,881 and is far too narrow.

MSP is a business model that describes how a company charges and what it commits to, not what it produces. Statistical classification does not work that way, which is why every MSP market number you have seen is somebody's estimate against their own inclusion rules.

What NAICS code covers MSPs?

None, and the reason is structural. NAICS is a production-oriented statistical system that groups establishments by similarity in how they produce goods or services. Two companies can both sell managed IT on a monthly contract and be classified differently based on what they primarily do.

The two codes that bracket the market:

NAICS 541512, Computer Systems Design Services, averaged 179,245 private establishments in 2025. It covers establishments primarily engaged in planning and designing integrated computer systems, including hardware and software. Most MSPs land here, and so do tens of thousands of firms that are not MSPs at all: systems integrators, custom developers, IT consultancies.

NAICS 541513, Computer Facilities Management Services, averaged 6,881 private establishments in 2025. It covers on-site management and operation of clients' computer systems or data-processing facilities. That is the closest description of the managed-services model in the whole system, and it captures only a fraction of the firms that describe themselves as MSPs.

The honest read: the real MSP population sits somewhere between those numbers, much nearer the smaller one in spirit and much nearer the larger one in filing behaviour, and no official source narrows it further.

How to build an MSP list anyway

The absence of a code does not make the market unreachable, it makes definition your job.

1. Write your inclusion rule first. Recurring contract, remote monitoring and management, a defined service catalogue, or a minimum share of revenue from managed services: choose, and write down what you excluded.
2. Use QCEW to size and locate. It supports an all-states, one-industry view and publishes establishment, employment and wage data at national, state, county and metropolitan level, so you can build territory maps from 541512 and 541513 before spending anything.
3. Filter by vendor ecosystem rather than by code. Which RMM, PSA and security stack an MSP runs is the strongest available qualifier and predicts fit better than size.
4. Use partner directories from the platforms MSPs actually run on. Those are self-selected by business model, which is exactly the attribute official data lacks.
5. Segment by client profile. An MSP serving dental practices and one serving law firms have different compliance obligations and buy differently.

Assembling a defined MSP universe from proxy codes and ecosystem signals is the specific problem Causo's IT services and MSP prospecting is built for.

Why generic databases miss MSPs

The category is self-declared, so a database returns whoever writes "managed services" on a homepage, including consultancies that ran one managed contract in 2019.

Classification scatters the real population across computer systems design, custom programming, facilities management, telecommunications, cybersecurity and broad IT consulting. No single filter reassembles it.

The qualifying attributes are absent: contract model, seat counts under management, vertical specialism, certifications and technology stack. Those decide everything and appear nowhere.

And scale is invisible in the usual fields. An MSP with 12 staff managing 4,000 endpoints and one with 12 staff doing project work look identical in a business database. The general failure of buying rows rather than qualifying them is covered in B2B prospecting for founders.

Selling software to MSPs: who decides

At the small end, which is most of this market, the owner or CEO decides, often personally technical and often the person who will run your product.

Two dynamics make MSPs unlike other software buyers. They are resellers as well as users, so the first question is frequently whether your product can be marked up and delivered to their clients rather than merely used internally. And they already run a dense stack of vendor tools with real switching costs, so displacement pitches lose to integration pitches unless the incumbent is genuinely failing.

Margin is the language. An MSP evaluates your product against the hours it removes from a technician's week or the revenue it adds per client, and a demo that does not translate into one of those two numbers will be polite and go nowhere. If you are still choosing a vertical, how to find customers for your startup covers the sequencing.