The nation’s market grew 46% to 15.5 million people in 
the first year that could be purchased through Act marketplaces, according to a study by the Kaiser Family Foundation.
Four states – California, Florida, Texas and Georgia -- accounted for almost half the growth. The number people covered in the market increased by more than 75 percent in six other states: Arkansas, Florida, Georgia, Maine, New York and Rhode Island.
The state-level analysis looked at 2014 recently submitted by insurers to state departments, and compared from December 2013 to December 2014.
The market figure had held fairly steady between 10.6 and 10.9 million from 2010 through 2013. Following implementation the marketplaces, rose to 15.5 million as the end 2014.