Directory of Certified Firms

Search Maryland DOT's Directory of Certified Firms by entering search terms and clicking Search. You must select at least one certification type.

*Firms that are noted as suspended cannot be utilized for-credit in new contracts until the suspension is removed. For additional details please reference the US DOT regulations or

NEW   You can use the Business Description field to search by Keyword based upon the specific types of work performed.

You can use the "Click to Lookup Commodity Codes" tool to search the NAICS codes and select one or more NAICS codes to search for all firms assigned that NAICS code. After adding one or more NAICS codes you have the option to check the boxes to Match any codes with same number code and/or Include any lower level codes of those selected.

Search results may be downloaded to Excel, by clicking the "Download Results to Excel" button after your search results are displayed. To download the full Certification Directory do not enter search criteria, scroll to the bottom of the page and click the "Download Entire Directory to Excel" button.

Click here for Terms of Use.

Click here for Frequently Asked Questions (FAQ).

Click here to view Fully Graduated Firms.

NOTE: This online directory lists firms certified by the Maryland Department of Transportation. Firms that appear in the directory are currently certified and approved to be utilized toward meeting established contract goals in their displayed certification North American Industry Classification System (NAICS) codes. Firms that are noted as “suspended” cannot be utilized for-credit on new contracts until the suspension is removed. For additional details please reference the US DOT regulations.

Click the certification type for contact information and certification details.

Search by Certification Type
 Airport Concessionaire Disadvantaged Business Enterprise (ACDBE)
 Disadvantaged Business Enterprise (DBE)
 Minority Business Enterprise (MBE)
 Small Business Enterprise (SBE)
Search by Business Name or DBA
Business Name/DBA
Tip: Try just a few letters of the firm's name.
Search by Business Description
Business Description
Tip: Try just a few letters of a keyword.
Search by Commodity Code
Commodity Codes
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Search by Contact Person
Contact Person/Owner
First Name
Tip: Use the first letter.
Last Name
Tip: Try the first few letters.
Search by Location
Zip Code
Tip: Search for multiple zip codes by separating with commas.
Phone Area Code
Search by Reference
Minority Status
Certified Since
Between and
Certification Number
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