POWER OF ATTORNEY
                         For Executing Forms 3, 4 and 5
                                   Directors

     Known all by those present, that the undersigned hereby constitutes and
appoints Jeff W. Dick and Thomas J. Chmelik as his or her true and lawful
attorney-in-fact to:

          1.   execute for and on behalf of the undersigned any such Forms 3, 4
               and 5 in accordance with Section 16(a) of the Securities and
               Exchange Act of 1934 and the rules and regulations promulgated
               thereunder with respect to the securities of MainStreet
               Bancshares, Inc.;


          2.   do and perform any and all acts for and on behalf of the
               undersigned which may be necessary or desirable to complete the
               execution of any such Forms 3, 4 or 5 and the timely filing of
               such form with the United States Securities and Exchange
               Commission and any other authority; and


          3.   take any other action of any type whatsoever in connection with
               the foregoing which, in the opinion of such attorney-in-fact, may
               be of benefit to, in the best interest of, or legally required
               by, the undersigned, it being understood that the documents
               executed by such attorney-in-fact on behalf of the undersigned
               pursuant to this Power of Attorney shall be in such form and
               shall contain such terms and conditions as such attorney-in-fact
               may approve in his/her discretion.

     The undersigned hereby grants to the above named attorney-in-fact full
power and authority to do and perform all and every act and thing whatsoever
requisite, necessary and proper to be done in the exercise of any of the rights
and powers herein granted, as fully and to all intents and purposes as such
attorney-in-fact might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or his/her substitute or substitutes, shall lawfully do or
cause to be done by virtue of this power of attorney and the rights and powers
herein granted.  The undersigned acknowledges that the foregoing attorney-in-
fact, in serving in such capacity at the request of the undersigned, are not
assuming any of the undersigned's responsibilities to comply with Section 16 of
the Securities Exchange Act of 1934, as amended ("Section 16"), or any other
responsibilities or liabilities of such individuals.  Such Power of Attorney
shall expire at such time that the undersigned is no longer deemed to be subject
to the reporting obligations under Section 16.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 17th day of April, 2019.


                                     /S/ JEFF W. DICK
                                     --------------------------
                                     Signature



                                     JEFF W. DICK
                                     ---------------------------
                                     Print Name