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These codes were in use from 1949 through the expiration of the 1975 baseplate in 1979.

First Letter: County

B: Belknap
C: Carroll
D: Strafford
E: Cheshire
F: Strafford
G: Grafton
H: Hillsborough
I: Hillsborough
J: Hillsborough
K: Rockingham
L: Hillsborough
M: Merrimack
N: Merrimack
O: Coos
P: Rockingham
R: Rockingham
S: Sullivan
Z: Cheshire

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