A Pentagon spokesman, Col Steve Warren, estimated that a half dozen tanks were abandoned, a similar number of artillery pieces, a larger number of armored personnel carriers and about 100 wheeled vehicles like Humvees.
He said some of the vehicles were in working condition; others were not because they had not been moved for months.
This repeats a pattern in which defeated Iraq security forces have, over the past year, left behind US-supplied military equipment, prompting the US to destroy them in subsequent airstrikes against Islamic State forces.
Warren also said that while the US is confident that Ramadi will be retaken by Iraq, "It will be difficult."
The fall of Ramadi has prompted some to question the viability of the Obama administration's approach in Iraq, which is a blend of retraining and rebuilding the Iraqi army, prodding Baghdad to reconcile with the nation's Sunnis, and bombing Islamic State targets from the air without committing American ground combat troops.
White House spokesman Josh Earnest said President Barack Obama has always been open to suggestions for improving the US approach in Iraq.
"It's something that he's talking about with his national security team just about every day, including today," Earnest said.
Derek Harvey, a retired Army colonel and former Defense Intelligence Agency officer who served multiple tours in Iraq, says that while the extremist group has many problems and weaknesses, it is "not losing" in the face of ineffective Sunni Arab opposition.
One alternative for the Obama administration would be a containment strategy trying to fence in the conflict rather than push the Islamic State group out of Iraq.
