Resident Population of Municipalities by County 1980, 1990 & 2000.
Driving distance from Huntsville, AL to Decatur, AL. The total driving distance from Huntsville, AL to Decatur, AL is 26 miles or 42 kilometers. Your trip begins in Huntsville, Alabama. It ends in Decatur, Alabama.
Decatur is located at 39Â°51â²6â³N 88Â°56â²39â³Wï»¿ / ï»¿39.85167Â°N 88.94417Â°Wï»¿ / 39.85167; -88.94417 (39.851636, -88.944228). Decatur is three hours southwest of Chicago, 40 miles due east of Springfield, the state capital, and two hours northeast of St. Louis by car.