Costco’s U.S. Comps Jump 6% in February

Costco reported sales of $6.38 billion for the four
weeks ended Feb. 27, 2011, an increase of 14% from $5.61
billion in the same four-week period of the prior fiscal year.

For the
twenty-six weeks ended Feb. 27, which includes the first two
weeks of the Company's fiscal third quarter, the company reported net sales
of $42.46 billion, an increase of 12% from $38.06 billion during
the comparable period of the prior fiscal year. Mexico sales accounted for
approximately three percentage points of the increase for both the
four-week and twenty-six week periods.

Comparable sales for the 4-week retail-reporting month of February and the
26-week retail-reporting period of September through February, including
Mexico operations for both this and last year, were as follows:

 
                             4 Weeks      26 Weeks
                            ---------     ---------
     U.S.                       6%            5%
     International             14%           14%

     Total                      8%            7%
                            =========     =========

Inflation in gasoline prices and strengthening foreign currencies had a
positive impact on comparable sales. Excluding these effects, comparable
sales were as follows:

 
                             4 Weeks      26 Weeks
                            ---------     ---------
     U.S.                       4%            4%
     International              7%            9%

     Total                      5%            5%
                            =========     =========

Costco currently operates 581 warehouses, including 424 in the United
States and Puerto Rico, 80 in Canada, 22 in the United Kingdom, seven in
Korea, six in Taiwan, nine in Japan, one in Australia and 32 in Mexico.