Combatants for The Battle of Boonville
Union Army of the West 
Brigadier General Nathaniel Lyon, Commander
Note: By the time Lyon reached Boonville, his forces numbered about 1,700 men. Lyon had left Colonel Henry Boernstein and three of his regiment's companies to occupy Jefferson City.
- First Missouri Infantry Regiment of Volunteers commanded by Colonel Frank P. Blair, Jr.
- Nine companies from the Second Missouri Infantry (Boernstein's) Regiment of Volunteers commanded by Lieutenant Colonel Frederick Schaefer
- Totten's Light Battery, Company F, Second U. S. Artillery commanded by Captain James Totten
- Company B, Second United States Infantry Regiment
- Two unattached companies of U. S. recruits
Missouri State Guard 
Major General Sterling Price, Commander
Note: Price became seriously ill with dysentery and had left to recuperate, so was not present at the Battle of Boonville. Command of the forces there fell to Missouri Governor Claiborne Fox Jackson. Brigadier General John B. Clark had been in command of the Missouri State Guard Forces before the arrival of Price and Jackson. Missouri State Guard forces present in Boonville numbered about 500 men, mostly untrained.
- First Regiment, Missouri Rifles commanded by Colonel John S. Marmaduke