The Census Bureau of the Department of Commerce announced today that the estimate of U.S. retail e-commerce sales for Q1 2004 was $15.5 billion, an increase of 28.1% from Q1 2003. Total retail sales for Q1 2004 were estimated at $834.8 billion, an increase of 8.8% from the same period a year ago. E-commerce sales in Q1 2004 accounted for 1.9% of total sales, while in Q1 2003 e-commerce sales were 1.6% of total sales. In Q4 2003, e-commerce sales were also 1.9% of total sales.