Reynosa, Tamaulipas a gritty, bustling city that runs up against the Rio Grande, has doubled in size from 265,663 in 1990 to 526,888 in 2005, according to official government statistics. Municipal officials in that city, however, point to other government databases that yield population estimates exceeding 1.5 million. Those officials argue that the federal government purposefully underestimates border populations to lessen the federal fiscal responsibility for the massive infrastructure needs of rapidly growing border cities.