Virtual Mailbox & Form 1583 Rules in Missouri
A commercial mailbox rental (CMRA) or private mailbox (PMB) service in Missouri cannot serve as your LLC's registered agent, though it may generally be used as a business address (verify with your specific provider). When establishing a virtual mailbox with the U.S. Postal Service, you will need to complete Form 1583. This form typically requires notarization, though the USPS may accept either a notary's signature or the CMRA owner's witnessing in some cases. Missouri permits remote online notarization (RON) under permanent legislation effective since 2020, meaning you can have Form 1583 notarized by a Missouri notary online rather than in person.
Because notarization rules and RON policies can change, you should verify current requirements directly on the official Missouri Secretary of State website and with your chosen mailbox provider before proceeding. This overview provides general information only and does not constitute legal advice. Confirm all requirements with official sources to ensure compliance with current state regulations.
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 | Mo. Rev. Stat. §486.1100 et seq.; 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.
Check your state's rule →Virtual address for an LLC in Missouri → · Choosing a provider →
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.