Original town settlement
Alexandria in the early 20th Century
Alexandria in the late 1940s
Alexandria in 1969
Alexandria in 1979
Alexandria in 1999 (and below: Alexandria today):
Original town settlement
Alexandria in the early 20th Century
Alexandria in the late 1940s
Alexandria in 1969
Alexandria in 1979
Alexandria in 1999 (and below: Alexandria today):
CenLamar 
Lamar
There is an even earlier map of Alexandria on display at the Louisiana History Museum as laid out by Alexander Fulton in 1805.
Also the 1872 Map which is the map of after the Civil War, when most of the original Alexandria was destroyed.
The city of Alexandria has also put together a map of current Alexandria with the old original plantations shown on this current day may. I found this interesting because my Great Grandfather C.C. Faust was the plantation manager of Willow Glynn Plantation in the early 1900’s.
Dale Genius
Louisiana History Museum.
503 Washington ST.