List of Illinois Civil War units

In recognition of Illinois’ six regiments' service in the Mexican War, regimental numbers for infantry in the Civil War began at seven. * 7th Illinois Infantry Regiment (3 Months) * 7th Illinois Infantry Regiment * 8th Illinois Infantry Regiment (3 Months) * 8th Illinois Infantry Regiment (3 Years) * 9th Illinois Infantry Regiment (3 Months) * 9th Illinois Infantry Regiment (3 Years) * 9th Illinois Infantry Regiment (Mounted) * 10th Illinois Infantry Regiment (3 Month) * 10th Illinois Infantry Regiment (3 Year) * 11th Illinois Infantry Regiment * 12th Illinois Infantry Regiment (3 Month) * 12th Illinois Infantry Regiment (3 Year) * 13th Illinois Infantry Regiment * 14th Illinois Infantry Regiment * 15th Illinois Infantry Regiment * 16th Illinois Infantry Regiment * 17th Il

List of Illinois Civil War units

In recognition of Illinois’ six regiments' service in the Mexican War, regimental numbers for infantry in the Civil War began at seven. * 7th Illinois Infantry Regiment (3 Months) * 7th Illinois Infantry Regiment * 8th Illinois Infantry Regiment (3 Months) * 8th Illinois Infantry Regiment (3 Years) * 9th Illinois Infantry Regiment (3 Months) * 9th Illinois Infantry Regiment (3 Years) * 9th Illinois Infantry Regiment (Mounted) * 10th Illinois Infantry Regiment (3 Month) * 10th Illinois Infantry Regiment (3 Year) * 11th Illinois Infantry Regiment * 12th Illinois Infantry Regiment (3 Month) * 12th Illinois Infantry Regiment (3 Year) * 13th Illinois Infantry Regiment * 14th Illinois Infantry Regiment * 15th Illinois Infantry Regiment * 16th Illinois Infantry Regiment * 17th Il