Exhibit 5.1


               [LETTERHEAD OF WILSON SONSINI GOODRICH & ROSATI]

                                 April 5, 2001

InfoSpace, Inc.
601 108th Ave N.E.
Suite 1200
Bellevue, Washington  98004

  RE:  REGISTRATION STATEMENT ON FORM S-8

Ladies and Gentlemen:

     We have examined the Registration Statement on Form S-8 to be filed by
InfoSpace, Inc. (the "Company") with the Securities and Exchange Commission on
or about April 6, 2001 (the "Registration Statement") in connection with the
registration under the Securities Act of 1933, as amended, of 35,000,000 shares
of the Company's common stock (the "Shares") to be issued upon exercise of stock
options granted pursuant to the InfoSpace, Inc. 2001 Nonstatutory Stock Option
Plan and the InfoSpace, Inc. and Saraide Inc. 2000 Stock Plan (collectively, the
"Plans"). As legal counsel for the Company, we have examined the proceedings
taken and are familiar with the proceedings proposed to be taken in connection
with the issuance and sale of the Shares to be issued under the Plans.

     It is our opinion that, when issued and sold in the manner described in the
Plans and pursuant to the agreements that accompany each grant under the Plans,
the Shares will be legally and validly issued, fully-paid and non-assessable.

     We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever appearing in the
Registration Statement, including any Prospectus constituting a part thereof,
and any amendments thereto.

                                       Very truly yours,

                                       /s/ Wilson Sonsini Goodrich & Rosati P.C.

                                       WILSON SONSINI GOODRICH & ROSATI
                                       Professional Corporation