WASHINGTON — Miles McEvoy has been hired as deputy administrator of the National Organic Program, effective Oct. 1, Secretary of Agriculture Tom Vilsack announced. The N.O.P. also will become an independent program area within the Agricultural Marketing Service of the U.S. Department of Agriculture based on increased visibility and emphasis on organic agriculture, evolving consumer preferences and the enhanced need for governmental oversight of the program. Mr. McEvoy led the Washington State Department of Agriculture’s Organic Food Program for more than 20 years. He helped establish the National Association of State Organic Programs in 1998 and is its president.