▁▁ 1 9 7 9 – 1 9 8 0 ▁William ▁Cooper , ▁Jr . ▁▁ 1 9 8 0 – 1 9 8 1 ▁Raymond ▁H . ▁War field ▁▁ 1 9 8 1 – 1 9 8 6 ▁Ron ald ▁K up fer man ▁▁ 1 9 8 6 – 1 9 8 7 ▁Raymond ▁H . ▁War field ▁▁ 1 9 8 7 – 1 9 9 2 ▁George ▁J . ▁Eng less on ▁ ▁The ▁City ▁of ▁Aber de en ▁ ▁In ▁ 1 9 9 2 , ▁the ▁ 1 0 0 th ▁anni versary ▁year ▁of ▁Aber de en ▁becoming ▁a ▁Town , ▁Aber de en ▁incorpor ated ▁as ▁the ▁City ▁it ▁is ▁today . ▁▁ 2 0 1 8 ▁shooting ▁ ▁On ▁September ▁ 2 0 , ▁ 2 0 1 8 , ▁ 2 6 - year - old ▁S no chia ▁M ose ley ▁opened ▁fire ▁at ▁a ▁R ite ▁A id ▁she ▁tempor arily ▁worked ▁at . ▁She ▁killed ▁three ▁co - work ers ▁and ▁injured ▁three ▁others ▁before ▁turning ▁the ▁gun ▁on ▁herself . ▁ ▁Geography ▁According ▁to ▁the ▁United ▁States ▁Census ▁Bureau , ▁the ▁city ▁has ▁a ▁total ▁area ▁of ▁, ▁of ▁which , ▁ ▁is ▁land ▁and ▁ ▁is ▁water . ▁ ▁Cl imate ▁The ▁climate ▁in ▁this ▁area ▁is ▁character ized ▁by ▁hot , ▁hum id ▁sum mers ▁and ▁generally ▁m ild ▁to ▁cool ▁winter s . ▁ ▁According ▁to ▁the ▁Kö ppen ▁Cl imate ▁Classification ▁system , ▁Aber