Best CMMC Registered Practitioner Organizations near Washington, D.C. for 2025

by Scott Jack
Content Contributor, E-N Computers
Over 10 years of experience in healthcare IT and tech support.

Updated September 19, 2025

Here are our picks for the best Registered Practitioner Organizations (RPOs) near Washington, D.C.

Registered Practitioner Organizations (RPO) are companies designated by the Cyber AB, the Department of Defense’s exclusive CMMC implementation partner, to provide consulting and implementation guidance for organizations working toward CMMC compliance. RPOs employ Registered Practitioners (RP), experienced IT professionals who have received CMMC training, and meet program requirements. It is highly recommended that organizations seeking certification work with an RPO or RP to identify gaps and implement controls.

But with some 200,000 defense contractors potentially trying to reach CMMC and only a limited number of RPOs to choose from, finding a good one is only going to get harder as more CMMC deadlines loom.

The CMMC market has attracted a lot of opportunistic players, so the real skill is separating the cybersecurity professionals who happen to do CMMC from the CMMC specialists who may not have deep security backgrounds. So here’s our short list to help you out.

E-N Computers (that’s us!) is an RPO in the Shenandoah Valley with two Registered Practitioners.

Every company here is listed on Cyber AB Marketplace, an official directory of RPs, RPOs, and C3PAOs. You can also check out our list of Best CMMC consultants for 2024. You can also visit our online Learning Center to read more about CMMC.

QUICK ANSWER:

Who are the best CMMC RPOs near Washington, D.C.?

If you’re looking for RPOs near Washington, D.C., we think you should consider E-N Computers Inc., 38North Security, ISI (Industrial Security Integrators), MBL Technologies, CMIT Solutions, and Coalfire Federal.

How to choose a good RPO
E-N Computers — Best Washington DC CMMC RPO for small businesses
38North Security — Best CMMC RPO in DC for global enterprises
ISI (Industrial Security Integrators) — Best CMMC RPO for defense-contractor security + compliance under one roof
MBL Technologies — Best veteran-owned CMMC RPO in Washington DC
CMIT Solutions — Best Washington DC CMMC RPO with a national network of franchisees
Coalfire Federal — Best Washington DC CMMC RPO with assessor expertise
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How to choose a good RPO

Check the badge: Make sure the firm is actually listed as an RPO on The Cyber AB Marketplace. While you’re there, see if they’re also a C3PAO so you can plan ahead. Remember, the same company cannot both prepare and assess you.
Start with scope, not tools: The best RPOs don’t jump straight into selling products or controls. They start by helping you define what’s in scope for CUI, mapping your data flows, and designing an enclave strategy if feasible. This step is huge and too often overlooked. A solid RPO will take time to understand how your business really works before recommending solutions. If they skip this, it’s a red flag.
Expect real deliverables: You’re not paying just for “tool configs.” A good RPO should give you written outputs—like an SSP, POA&M, policies, inventories, and evidence plans. The ones who do this consistently usually advertise it clearly on their site.
Match to your industry: Every sector has quirks. If you’re in construction, engineering, aerospace, or manufacturing, look for an RPO that already knows your space.
Ask about the process: A credible RPO will talk about roles (what you do vs. what they do), timelines, weekly check-ins, and the impact on your team. If the plan sounds too easy or too fast, be cautious.
Look for measurable progress: Readiness should be scored against NIST 800-171 with a clear gap analysis and remediation steps that tie directly to CMMC practices.
Look for experience before CMMC: The RPOs who’ve been doing cybersecurity compliance for years before CMMC existed tend to be more reliable than those who pivoted specifically for this opportunity.

E-N Computers — Best Washington DC CMMC RPO for small businesses

Coalfire Federal home page - best Washington DC CMMC registered practitioner organization

Website: https://encomputers.com/

Location: Waynesboro, VA and Washington, DC

We’re including ourselves so you know who’s making these recommendations. E-N Computers partners with manufacturers, engineering firms, and government entities (10-200 employees) on CMMC compliance.

Unlike firms that recently jumped into CMMC consulting, we’ve developed this expertise over six years helping existing clients achieve compliance, and we’ve been in business nearly 30 years with a deep focus on cybersecurity.

We take a collaborative approach – working with your team rather than replacing it – because compliance works best when your people understand the process. Clients work directly with owner Ian MacRae, not rotating consultants, and we’re fully Virginia-based for true partnership relationships.

38North Security — Best CMMC RPO in DC for global enterprises

38North Security home page - best Washington DC CMMC registered practitioner organization

Website: https://38northsecurity.com/

Location: Washington, D.C.

38North Security is the only company on this list in D.C. proper. With some of the best and most experienced cybersecurity professionals around, they help complex, global enterprises to implement secure cloud solutions and reach security compliance. 38North’s CMMC page provides a brief overview of the process and their services including scoping, workshops, gap analysis, advisory support, and remediation support.

ISI (Industrial Security Integrators) — Best CMMC RPO for defense-contractor security + compliance under one roof

InQwest homepage - best Washington DC CMMC registered practitioner organization

Website: https://isidefense.com

Location: Herndon, VA (D.C. metro)

ISI focuses on defense contractors and pairs CMMC/NIST compliance with managed security and industrial security (FSO/clearance) services—useful if you want one partner across cyber and industrial security. Their site highlights CMMC readiness, ongoing security services, and in-house SWFT fingerprinting at their Herndon headquarters; The Cyber AB Marketplace lists ISI as an RPO with Registered Practitioners.

MBL Technologies — Best veteran-owned CMMC RPO in Washington DC

MBL Technologies home page - best Washington DC CMMC registered practitioner organization

Website: https://mbltechnologies.com/

Location: Arlington, VA

MBL Technologies offers advisory and remediation services that include readiness reviews, gap analysis, documentation, resolving vulnerabilities, and engineering and implementing technical solutions. They focus on “hot buttons” like encryption and hardening, and work to consolidate any other compliance requirements you might have into your compliance program.

CMIT Solutions — Best Washington DC CMMC RPO with a national network of franchisees

CMIT Solutions home page - best Washington DC CMMC registered practitioner organization

Website: https://cmitsolutions.com/

Location: Fairfax, VA (National HQ: Austin, TX)

CMIT Solutions is a national franchise with its headquarters in Fairfax, VA. They highlight their CMMC compliance services, particularly for construction and engineering firms. You can expect a preliminary risk assessment and a plan of action to help you prepare for your assessment. Not every franchise has a Registered Practitioner, but franchises form a strong network to provide the expertise you need.

Coalfire Federal — Best Washington DC CMMC RPO with assessor expertise

Website: https://coalfirefederal.com/

Location: Chantilly, VA

Coalfire Federal is uniquely both an RPO and an Authorized C3PAO.. They cannot serve as both your advisor and assessor, but you may appreciate their additional perspective. Their RPO advisory services include:

CUI boundary analysis: They will help you determine what data and systems are in-scope for the project
Gap analysis: They will evaluate your readiness and identify areas that need improvement.
Remediation support: They will help you close the gaps and prepare for certification.

They also offer mock assessments, which can be helpful for determining the likely outcome of an actual assessment. To make sure that you have more than one set of eyes looking for weak spots, though, we recommend using someone other than your RPO for a mock assessment.

If you need CMMC managed IT services