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See Homepage. This page: Find out more about the 'IO' series of registration numbers, used in the Kildare area.

IO series of older car registration numbers.

Registration letters >> IO series
This page lists registration number codes from the IO series, a series allocated to the Kildare area. Also included, where known, are the date periods that these car registration numbers were used in. The data covers the period of 1900 through to 1972, so registrations seen on later cars wouldn't necessarily be included in this information.

Interpreting a car's registration number.

The majority of post-war car numbers incorporate a three letter code - where this is the case, letters 2 and 3 signify the location code. So, for instance, a car with the registration number 638 GIO or TIO 512D would be a Kildare-issued number. A car with just two letters, ie IO, would also be from this area. Listed below are the known IO series registrations, with added information (where available) describing when each series was first used, and in a few cases, when it came to an end. Some letter codes were used for more than one period during the 20th Century. This information can be invaluable when trying to date vehicles seen in old photographs, or in old films for instance.
Also if your car has lost it's original registration, perhaps sold off by a previous owner as a "cherished" number, this information will help you find a suitable replacement, or at least identify which series would be suitable, based on the age of your car and where it was first registered.
IO Registrations - Kildare.
Reg. Letters Year Letter Start -> End Date (if known)
AIO APR 1963 ->

BIO JAN 1964 ->

CIO AUG 1964 ->

DIO APR 1965 ->

EIO JAN 1966 ->

FIO OCT 1966 ->

GIO JUN 1967 ->

HIO FEB 1968 ->

IO DEC 1903 -> JUN 1953

JIO SEP 1968 ->

KIO APR 1969 ->

LIO NOV 1969 ->

MIO JUN 1970 ->

NIO NOV 1970 ->

PIO JUN 1971 ->

RIO JAN 1972 ->

SIO JUL 1972 ->

TIO JAN 1973 ->

UIO JUN 1973 ->

VIO OCT 1973 ->
Return to the main vehicle registrations page.

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