Home Driver's License Massachusetts
Massachusetts Driver's License validator
How the Driver's License format works
- Format
- 1 letter followed by 8 digits, or 9 digits
- Example
- S12345678
Things to watch for
- Format-only check — does not confirm the license actually exists, is valid, or is registered to a real driver
- Massachusetts issues a plain 9-digit number to most drivers; a letter-prefixed form (often S or SA) also appears in older records
- Runs entirely in your browser — nothing you type is transmitted or stored
^([A-Z]\d{8}|\d{9})$A Massachusetts driver’s license number is, for most current drivers, a plain 9-digit all-numeric string issued by the Massachusetts Registry of Motor Vehicles (RMV) — Massachusetts is one of the states that kept the older “Registry” naming rather than switching to “Department of Motor Vehicles.” A letter-prefixed form, commonly starting with S or SA followed by 8 digits, also shows up in older RMV records and remains a valid, documented shape.
What this checker verifies
This tool accepts either the plain 9-digit numeric form or a leading letter followed by 8 digits, rejecting anything that fits neither — such as a digit count that matches neither pattern or a letter appearing somewhere other than the start.
What a pass doesn’t confirm
Neither Massachusetts shape carries a check digit this tool verifies, so a format match is the strongest confirmation a client-side check gives. It doesn’t confirm the RMV actually issued that number, that the license is currently valid, or that it belongs to a real driver.
Scope: format-only validation across both documented forms, entirely client-side.
Content last reviewed 2026-08-09.
Driver's License FAQ
What is the format of a Massachusetts driver's license number?
Most Massachusetts drivers hold a plain 9-digit number, issued by the Massachusetts Registry of Motor Vehicles (RMV). A letter-prefixed form — often starting with S or SA followed by 8 digits — also appears in older records and is accepted here.
Why is Massachusetts's licensing agency called the RMV, not the DMV?
Massachusetts, along with a couple of other New England states, uses the historic term 'Registry of Motor Vehicles' rather than 'Department of Motor Vehicles' — the RMV name predates the more common DMV branding used across most of the country.
Does a valid format confirm the license is currently active?
No. It only confirms the string matches one of the two documented shapes, not that the RMV has that number on file or that the license is valid.