

                                                                    EXHIBIT 23.1

                         CONSENT OF INDEPENDENT AUDITORS

   

     We consent to the reference to our firm under the caption  "Experts" and to
the use of our reports dated March 12, 1998 for Realty  Information Group, Inc.,
February 10, 1998 for Realty Information Group, L.P., and March 12, 1998 for OLD
RIG,  Inc.,  in  Amendment  No. 4 to the  Registration  Statement  (Form S-1 No.
333-47953)  and related  Prospectus of Realty  Information  Group,  Inc. for the
registration of 2,500,000 shares of its common stock.

                                            /s/ Ernst & Young LLP

Washington, D.C.
June 30, 1998
    
