The increases in business activity and in residential construction for the year ending in April 1955 were accompanied by an increase in the mobility of the American people, according to the results of a sample survey announced today by Robert W. Burgess, Director, Bureau of the Census, Department of Commerce. This increase was shared by many different parts of the population. In April 1955, 19.9 percent of persons 1 year old and over living in continental United States were living in a different house from the one they lived in a year earlier; in April 1954, the corresponding figure was 18.6 percent. Of the 158 ½ million persons 1 year old and over in April 1955, 21 million, or 13.3 percent, were living in a different house in the same county as a year ago and 10 ½ million, or 6.6 percent, were living in a different county. An additional million persons, or 0.6 percent, had come into the United States from abroad. The increase in the number of movers was largely attributable to the rise in the number of short distance (within-county) movers from 19 million in the previous year.