Alliant National Title Insurance Company Share: Title Companies Alliant National Title Insurance Company Visit Website Request Info 1831 Lefthand Cir., Ste. G Longmont, CO 80501 303-682-9800 ext. 300 www.alliantnational.com About Map About Alliant National Title Insurance Company is headquartered in Colorado and was founded in 2005 by a seasoned group of title insurance industry veterans, business leaders and entrepreneurs. What's Nearby? Distance: 5 10 15 20 25 50 mi.