Exhibit 21 Subsidiaries of Hub Group, Inc. SUBSIDIARIES JURISDICTION OF INCORPORATION/ORGANIZATION Hub City Terminals, Inc. Delaware Hub City Alabama, L.P. Delaware Hub City Atlanta, L.P. Delaware Hub City Boston, L.P. Delaware Hub City Canada, L.P. Delaware Hub City Cleveland, L.P. Delaware Hub City Dallas, L.P. Delaware Hub City Detroit, L.P. Delaware Hub City Florida, L.P. Delaware Hub City Golden Gate, L.P. Delaware Hub City Houston, L.P. Delaware Hub City Indianapolis, L.P. Delaware Hub City Kansas City, L.P. Delaware Hub City Los Angeles, L.P. Delaware Hub City Mid Atlantic, L.P. Delaware Hub City New Haven, L.P. Delaware Hub City New Orleans, L.P. Delaware Hub City New York State, L.P. Delaware Hub City New York-New Jersey, L.P. Delaware Hub City North Central, L.P. Delaware Hub City Ohio, L.P. Delaware Hub City Philadelphia, L.P. Delaware Hub City Pittsburgh, L.P. Delaware Hub City Portland, L.P. Delaware Hub City Rio Grande, L.P. Delaware Hub City St. Louis, L.P. Delaware Hub City Tennessee, L.P. Delaware Hub Group Associates, Inc. Illinois Hub Highway Services Illinois Hub Group Distribution Services Illinois Hub Holdings, Inc. Delaware Q.S. of Illinois, Inc. Illinois Quality Services L.L.C. Missouri Quality Services of Kansas, L.L.C. Kansas Quality Services of New Jersey, L.L.C. New Jersey Quality Services of Michigan L.L.C. Michigan Q.S. of Georgia, L.L.C. Georgia