moini.net - Jim Moini's License Plates
VISITOR PLATES Visitor plates were issued to cars from other states which were driving through New Jersey.
 
Starting in 1926, corresponding with the start of county codes on passenger plates, the code "4" was used for "Out of State Registrants".

1926
New Jersey Non-Resident Visitor License Plate

1927Paul Kovalski
New Jersey Non-Resident Visitor License Plate

1928Lee Madigan
New Jersey Non-Resident Visitor License Plate

1929
New Jersey Non-Resident Visitor License Plate

1930Lee Madigan
New Jersey Non-Resident Visitor License Plate

1931
New Jersey Non-Resident Visitor License Plate

1932
New Jersey Non-Resident Visitor License Plate

In 1956, a plate collector from New Jersey realized that the law governing visitor plates still existed.
He convinced a friend from Pennsylvania to register one of his company vehicles in New Jersey,
thus forcing the DMV to produce a 4- prefix visitor plate.

As far as we know, this was the only one produced.

1956Paul Kovalski
New Jersey Non-Resident Visitor License Plate


After this plate was issued, the DMV repealed the law so this did not happen again.
Story from Phil Leib