This report contains estimates of hearing levels for children 6 to 11 years of age in the United States as determined in the second cycle of the Health Examination Survey, conducted during 1963-1965. A probability sample (N=7,119) was selected to represent the 24 million children 6 to 11 years of age in the noninstitutional population. Hearing threshold levels for the right ear and left ear of each child examined were determined individually by air conduction with standard pure-tone audiometers at eight frequencies. Testing was done under carefully controlled conditions in a specially constructed trailer. The report gives findings by age and sex for the right ear, left ear and better ear at each of the test frequencies, and also presents estimates of hearing levels for speech. Comparison of the present study findings with findings from some of the previous large-scale hearing surveys, such as the 1935-1936 National Health Survey and the Pittsburgh Surveys, is included. Tables and appendixes comprise two thirds of the document. (Author/NH)