It’s difficult to quantify the population of homeless female veterans, but there are indications the number is growing. Locally, 10 percent of Baltimore’s homeless population as of January — or 276 people — were veterans, according to the Mayor’s Office of Human Services. Female veterans account for around 3 percent of the total veterans seen in the homeless services system, a number that has remained constant over the past three years, according to Terry Hickey, director of the Mayor’s Office of Human Services. Nationally, the number more than doubled from 1,380 in 2006 to 3,328 in 2010, according to limited U.S. Department of Veterans Affairs data analyzed by the U.S. Government Accountability Office in 2011. The Virginia-based nonprofit Final Salute Inc., which serves homeless female veterans, has published estimates in recent years that there are 55,000.