NUMBER BLOCKS   1954-1955
NUMBER BLOCKS INDEX
1956-1957 →
The tables below have the prefixes for each state's license plates for 1954-55.
The actual number ranges were not specified in the official document.

The type of plate was determined by the colors - refer to my Numbering and Colors page for details.

The number was delimited by dashes for every two digits, as was typical for the all-numeric Mexican plates of the 50's:
For example:     1, 11, 1-11, 11-11, 1-11-11, 11-11-11.

The information comes from the document 'Diario Oficial' published by the government of Mexico.
The issue dated 2 October 1953 contains the license plate specifications.
ALL VEHICLES   1954-55
State Prefix Highest Observed
DISTRITO FEDERAL DF 5-46-19
AGUASCALIENTES AG
BAJA CALIFORNIA BC 2-65-72
BAJA CALIFORNIA SUR BS
CAMPECHE CA
CHIAPAS CS
CHIHUAHUA CH 1-80-89
COAHUILA CI 5-46
COLIMA CO
DURANGO DO
GUANAJUATO GN 22-36
GUERRERO GR 32
HIDALGO HD
JALISCO JA 89-66
MEXICO MX
MICHOACAN MI 40-88
MORELOS MO
NAYARIT NA
NUEVO LEON NL 1-24-57
OAXACA OX
PUEBLA PA
QUERETARO QE 8-68
QUINTANA ROO QR 77
SAN LUIS POTOSI SL
SINALOA SI 8-99
SONORA SO 1-17-63
TABASCO TB
TAMAULIPAS TS 99-00
TLAXCALA TX
VERACRUZ VZ 84-26
YUCATAN YU 33-77
ZACATECAS ZA

For some reason, Baja California Sur was omitted from the official document.
I will guess that "BS" was the prefix used for Baja California Sur.