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THE PLATE RECORD · 1950–2008 AND AFTER
For two generations, every license plate issued to a car on this ground announced its county before its number: St. Joseph County's number in Indiana's county-prefix system is 71 — seventy-first in the alphabetical assignment that runs from Adams County at 1 to Whitley at 92. This pass verified the number independently of the sibling running that first banked it: the Bureau's own published list, "Indiana County Numbers and County Names," prints "71 — St. Joseph," and the general plate record agrees. The number is the one piece of the Bureau's record that was physically seated in Osceola for decades at a time, riding on every bumper in every driveway of the town.
The course runs in three systems. County designations first appeared on Indiana plates with the 1950 issue, as two-letter codes: the plate-history record gives St. Joseph County's codes as BB through BH, while the ShopLicensePlates county key prints BB–BK and BN for the same county and years. The conflict is printed whole, unharmonized; surviving plates and the Bureau's issuance records settle it, and the gap is named below. In 1963 the familiar system began — the two-digit county number as the serial's prefix, the form most Hoosiers know — which ran in spirit long after the serial itself changed. Within that system the letter following the county number identified the issuing branch: in the 1999–2003 series, the plate references give the example directly — "71 stands for St Joseph and E for South Bend" — so a plate reading 71E was a county-seat issuance. St. Joseph's volume outgrew the single-letter plan in time: the county stands among those that moved to a two-letter serial format, 71AB123, seen on the 2000 base. The issuing-branch letters for Mishawaka and Walkerton are not given in the references reached and are named gaps.
The documented size of the county's plate record, at the strength the references support, is a pair of allocation ceilings computed by the plate-history record from the formats themselves: 69,993 plates issuable under the 1950 letter scheme, 239,976 under the 1963 number scheme. These are ceilings, not registrations — the number of St. Joseph County cars actually registered in any year of the system stands in the Secretary of State's and the Bureau's annual reports, which are named as the settling source for the county's first registrations in the closing article. What the ceilings settle is scale: a county whose plate allocation ran to six figures was never going to be served from a village counter, and Osceola's plates always came from the county's cities — first by mail from Indianapolis, then over the South Bend and Mishawaka counters, and since 2012, as the modern article prints, by mail from Indianapolis again.
Principal sources: Indiana Bureau of Motor Vehicles, "Indiana County Numbers and County Names" (the Bureau's published county-number list, read November 2026); the plate-history record (1950 and 1963 schemes, allocation ceilings); ShopLicensePlates county key (the conflicting 1950 codes); LicensePlateMania branch-letter record (71E).