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Where was Your Car  Produced?
 Assembly Plant Codes
(The first letter on the small plate tells us where.)
P
C
L
W
K
A
F
 Pontiac, Michigan 
South Gate, California 
Linden, New Jersey 
Wilmington, Delaware 
Kansas City, Kansas 
Atlanta, Georgia 
Framingham, Massachusetts
 Use the first character from the smaller plate to find out which Pontiac plant manufactured your car.
The California plant was in South Gate a few miles from where I live in Downey.  My parts car 47-2519 and my 47-2507 were both built there. My 47 and 48 wagons (and I believe all wagons) are from the Michigan plant.
Thanks to Ted Cram for the 42 info and the list of cities where Pontiacs were manufactured and also
for the break down of the numbers for each factory .
Note the very small production runs, at some of the smaller plants, particularly in 1947.
Remember to subtract 1000 to get the actual numbers.
1942
Torpedo Sixes 

P6 KA 1001-25802      - Michigan  
C6 KA 1001-3260       - California  
L6 KA 1001-3428       - New Jersey
Torpedo Eights

P8 KA 1001-13146       -Michigan 
C8 KA 1001-2070        -California 
L8 KA 1001-2205         -New Jersey
Streamliner Sixes

P6 KB 1001-11115     -Michigan  
C6 KB 1001-2170      -California 
L6 KB 1001-2181      -New Jersey
Streamliner Eights

P8 KB 1001-22928       -Michigan  
C8 KB 1001-3127        -California 
L8 KB 1001-3451        -New Jersey
 
1946
 Torpedo Sixes 

P6 LA 1001-17381      - Michigan  
C6 LA 1001-3314        - California  
L6 LA 1001-4721        - New Jersey 
K6LA 1001-2520         -Kansas
Torpedo Eights

P8 LA 1001-13652       -Michigan 
C8 LA 1001-2786         -California 
L8 LA 1001-3738         -New Jersey 
K8LA 1001-2085          -Kansas 
Streamliner Sixes

P6 LB 1001-35238     -Michigan  
C6 LB 1001-3696       -California 
L6 LB 1001-5357       -New Jersey 
K6LB 1001-2299       -Kansas
Streamliner Eights

P8 LB 1001-39764       -Michigan  
C8 LB 1001-4257         -California 
L8 LB 1001-6618         -New Jersey 
K8LB 1001-2590          -Kansas
 
1947
        Torpedo Sixes 

P6 MA 1001-37322      -Michigan   
C6 MA 1001-7794       -California    
L6 MA 1001-13895      -New Jersey 
W6MA 1001-1850       -Delaware 
K6MA 1001-8096        -Kansas 
A6MA  - None              -Georgia
Torpedo Eights

P8 MA 1001-22682       -Michigan 
C8 MA 1001-4150        -California 
L8 MA 1001-7387        -New Jersey 
W8MA 1001-1431       -Delaware 
K8MA 1001-4165        -Kansas 
A8MA -None                -Georgia
Streamliner Sixes

P6 MB 1001-27844       -Michigan   
C6 MB 1001-3976        -California   
L6 MB 1001-7877         -New Jersey 
W6MB 1001-1562         -Delaware 
K6MB 1001-4569         -Kansas  
A6MB 1001-1080          -Georgia 
Streamliner Eights

P8 MB 1001-56382        -Michigan  
C8 MB 1001-8197         -California 
L8 MB 1001-15246        -New Jersey 
W8MB 1001-1954         -Delaware 
K8MB 1001-9184          -Kansas 
A8MB 1001-1145          -Georgia
 
1948
           Torpedo Sixes 

P6 PA 1001-25366       - Michigan  
C6 PA 1001-5150        - California   
L6 PA 1001-5301         - New Jersey  
W6 PA 1001-4575       -Delaware  
K6 PA 1001-5303        -Kansas  
A6 PA 1001-3529        -Georgia  
F6 PA 1001-3454        -Massachusetts
Torpedo Eights

P8 PA 1001-18933       -Michigan 
C8 PA 1001-4368        -California 
L8 PA 1001-5471        -New Jersey 
W8 PA 1001-3854       -Delaware 
K8 PA 1001-4134       -Kansas 
A8 PA 1001-2820       -Georgia 
F8 PA 1001-2720        -Massachusetts
Streamliner Sixes

P6 PB 1001-18146       -Michigan 
C6 PB 1001-4765        -California  
L6 PB 1001-4350        -New Jersey  
W6 PB 1001-3772       -Delaware 
K6 PB 1001-5552       -Kansas 
A6 PB 1001-2926        -Georgia 
 F6 PB 1001-2951       -Massachusetts
Streamliner Eights

P8 PB 1001-61682        -Michigan  
C8 PB 1001-13302       -California 
L8 PB 1001-12359        -New Jersey 
W8 PB 1001-10616      -Delaware
K8 PB 1001-16561       -Kansas 
A8 PB 1001-7603        -Georgia 
F8 PB 1001-7776         -Massachusetts