ComScore has released their US Search Rankings for September this morning. Google.com remains the market leader, with it’s properties dominating with a 57% market share. This equates to 5.7 Billion Core Searches for the month. The 57% for Google is a half percentage point up from last month.

Yahoo! and Ask properties also saw an increase in market share, while Microsoft lost some ground. Yahoo! came in at 23.7% of total searches, Microsoft properties at 10.3%, and Ask Network at 4.7%.

Total search volume in September was roughly 9.4 Billion total searches, down from 9.8 Billion total searches in August. This can be explained by several reasons - shorter month, long weekend holiday and the return of many students/professionals on summer vacation back to a busy work schedule.

Here is the official Press Release from ComScore

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