|Rank||Company||Local lic. prof.engineers/Year founded|
|1||Fuss and O'Neill Inc., Manchester||59/1924|
|2||AECOM (1), Rocky Hill||52/1970|
|3||AI Engineers, Inc., Middletown||48/1991|
|4||BL Companies Inc./Meriden||35/1986|
|5||Milone & MacBroom Inc., Cheshire||33/1984|
Source: Individual companies./Compiled by Roger Magnus.
(1) URS and AECOM have joined together as one company as of Oct. 2014.
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