JoethePlumberNet How-To.

Where you can verify contractor license in states from Massachusetts to New Jersey.

Massachusetts contractor license check:

To verify registration of Massachusetts home improvement contractor and check if there were complaints against him use this online Registration Lookup. You can also check if the Massachusetts home improvement contractor has lost any arbitration cases or has had any Guaranty Fund claims filed against him using this online search.
To verify a Massachusetts electrician, plumber, etc. license and find if there were any disciplinary actions taken against it use this online service.
For more information go to "Where to complain about plumber or contractor in Massachusetts".

Michigan contractor license check:

To verify Michigan contractor's license, use this online service.
To check if the residential builder is licensed in Michigan use this search.
For more information go to "Where to complain about plumber or contractor in Michigan".

Minnesota contractor license check:

To verify Minnesota contractor's license, use this online service. You can also check if there are any punitive actions by DOLI taken against the license of Minnesota residential building contractor, or Minnesota plumber, or Minnesota electricians.
For more information go to "Where to complain about plumber or contractor in Minnesota".

Mississippi contractor license check:

To verify Mississippi Residential Building, Remodeling, or Roofing contractor license, use this online service. To check if the plumber, or HVAC contractor, or electrician has a Mississippi specialty contractor license, use this online service. Each County or Municipality may have additional regulations regarding permits and licenses. Make sure to contact your local permit office to get more information.
You can also check if MSBOC has any complaints against the commercial or residential contractor.
For more information go to "Where to complain about plumber or contractor in Mississippi".

Missouri contractor license check:

Missouri does not have a general contractors license. General contractors are licensed and regulated at the local level. To verify contractor license in Missouri contact your local licensing office.
For more information go to "Where to complain about plumber or contractor in Missouri".

Montana contractor license check:

To find if a plumber, electrician, or other professional is licensed in Montana go here and click on the "SEARCH FOR A LICENSEE" link under "Licensee Lookup". You will also be able to see any disciplinary actions against this licensee.
To check if independent contractor is registered in the State of Montana, use this online service. To check the registration of a Construction Contractor in Montana use this online search.
For more information go to "Where to complain about plumber or contractor in Montana".

Next page: Check contractor license in states from New Mexico to South Carolina.