Google accounted for 65.1 percent of all US searches in the four weeks ended Dec. 1, while Yahoo Search, MSN Search and Ask.com received 21.2 percent, 7.1 percent and 4.6 percent, respectively, writes MarketingCharts, citing Hitwise.

The remaining 46 search engines it tracks accounted for less than 2.0 percent.

Google is also growing as a source of traffic to key industries, Hitwise said. Search engines remain the primary way internet users navigate to key industry categories, with Google leading the way.

Three categories - Travel, Entertainment, and Business and Finance - had double-digit increases (Nov. '06 to Nov. '07) in the share of traffic coming directly from search engines.