Registration letters >> IO series
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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.
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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.
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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.
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IO Registrations - Kildare.
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Reg. Letters |
Year Letter |
Start -> End Date (if known) |
AIO |
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APR 1963 -> |
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BIO |
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JAN 1964 -> |
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CIO |
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AUG 1964 -> |
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DIO |
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APR 1965 -> |
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EIO |
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JAN 1966 -> |
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FIO |
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OCT 1966 -> |
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GIO |
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JUN 1967 -> |
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HIO |
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FEB 1968 -> |
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IO |
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DEC 1903 -> JUN 1953 |
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JIO |
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SEP 1968 -> |
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KIO |
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APR 1969 -> |
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LIO |
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NOV 1969 -> |
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MIO |
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JUN 1970 -> |
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NIO |
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NOV 1970 -> |
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PIO |
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JUN 1971 -> |
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RIO |
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JAN 1972 -> |
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SIO |
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JUL 1972 -> |
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TIO |
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JAN 1973 -> |
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UIO |
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JUN 1973 -> |
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VIO |
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OCT 1973 -> |
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Return to the main vehicle registrations page.
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