Google accounted for 65.98% of all US searches in December 2007. Yahoo! Search, MSN Search and Ask.com each received 20.88%, 7.04% and 4.14%. The remaining 49 search engines in the Hitwise Search Engine Analysis Tool accounted for 1.71% of US searches.
| Domain | December 2007 | November 2007 | December 2006 |
| www.google.com | 65.98% | 65.10% | 63.15% |
| search.yahoo.com | 20.88% | 21.21% | 21.62% |
| search.msn.com | 7.04% | 7.09% | 9.80% |
| www.ask.com | 4.14% | 4.63% | 3.72% |
| Source: Hitwise | |||