Twenty-four current units of the Army National Guard perpetuate the lineages of militia units mustered into federal service during the War of 1812. Militia units from nine states that were part of the Union by the end of the War of 1812 (Delaware, Georgia, Maryland, Massachusetts, New Jersey, New York, Pennsylvania, South Carolina and Virginia), plus the District of Columbia, are the predecessors of eighteen units that currently exist in the Army National Guard. Two of the four units derived from Virginia militias are in the West Virginia National Guard; at the time of the War of 1812, West Virginia was still part of Virginia. Only two current units, the 155th Infantry, a component of the Mississippi National Guard derived from militia units organized in the Mississippi Territory and the 130th Infantry, a component of the Illinois National Guard derived from militia units formed in the Illinois Territory, are from states or territories west of the Appalachians. Unfortunately, no militia units from the states of Kentucky, Louisiana, Ohio or Tennessee, or from the Indiana, Michigan, Missouri or Louisiana Territories, where militia units played a major role in the fighting, have survived as units in the modern Army National Guard.
There are also twenty-three active Regular Army battalions with campaign credit for the War of 1812.