Virtual Mailbox & Form 1583 Rules in Colorado
A Commercial Mail Receiving Agency (CMRA) or private mailbox (PMB) in Colorado cannot serve as your LLC's registered agent for legal documents. However, a CMRA address can generally be used as a business address; verify current requirements with the Colorado Secretary of State. When opening a virtual mailbox with the U.S. Postal Service, you must complete USPS Form 1583, which typically requires notarization or witnessing by the CMRA owner. Colorado allows remote online notarization (RON) under permanent authority established by SB 19-096, meaning you can have a Colorado notary notarize your Form 1583 entirely online.
Because notarization rules can vary by postal location and provider, confirm the current witnessing requirements directly on the official USPS and Colorado Secretary of State websites before proceeding. This overview is regulatory information only and does not constitute legal advice. Requirements change periodically, so verify all details with official sources before establishing your virtual mailbox.
How a virtual mailbox works
A virtual mailbox is a real street address at a commercial mail-receiving agency (CMRA) that scans your mail; opening one means filing USPS PS Form 1583, witnessed by a notary or the provider, with two IDs.
| Detail | As the rule stands |
|---|---|
| Can a virtual mailbox be your registered agent? | No (a PMB cannot be your registered agent) |
| Can it be your LLC business address? | Generally yes — verify |
| Online notarization (RON) for Form 1583 | Online notarization (RON) available |
| Form 1583 witnessing | Notary or CMRA-owner witness (in person or by A/V) |
| PMB designator (address line) | 'PMB <number>' or '# <number>' (USPS DMM 508.1.4) |
| Governing citation | C.R.S. §24-21-514.5; USPS DMM 508.1.8 |
Opening any virtual mailbox means filing USPS PS Form 1583. The form must be witnessed — by a notary or by the mailbox provider (the CMRA owner/manager), in person or by real-time audio-video under the 2024 CMRA Clarification rule — and you supply two acceptable IDs. It is usually notarized, and the notarization can be done online via remote online notarization (RON) wherever the state allows it.
Confirm before you file. This is informational only, not legal advice. The official state Secretary of State / notary page and USPS are the authoritative sources.
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Compiled from the USPS federal baseline (DMM 508 / 39 CFR) and the state notary/RON statute, and verified June 2026. Always confirm the current rule on the official state Secretary of State / notary page before you rely on it — RON law is still moving. This state's RON status is currently medium-confidence (the exact statute section is not yet pinned), so treat the online-notarization detail as a starting point and confirm it on the official page. How we compile this. Informational only, not legal advice.