The figure, a 2 million box decline from March, comes from the U.S. Department of Agriculture's most recent 2011-12 crop estimate.
The decrease was seen entirely in the Valencia crop, which dropped to 71 million boxes from 73 million. Early and mid-season varieties remained at 74 million boxes.
During the 2010-11 season, Florida growers produced 139 million boxes of oranges.
Grapefruit production is predicted to increase slightly to 18.8 million from 18.7 million 85-pound boxes, according to the USDA estimate.
Tangelo and tangerine production remained unchanged with 1.15 million and 4.3 million boxes, respectively.
The USDA makes its initially assessment of the citrus crop in October and issues monthly updates through July.