All about Kansas license plates

1961-69

(From the collection of Marc Welby)
The white-on-blue 1951 tag is notable in two ways.  First, it introduced the two letter "county code" still in used today.  Second, the tag itself is literally shaped like the state of Kansas.  This tag, by the way, is from Pratt county.
(Courtesy Plateshack.com)
For 1952, a black-on-white "52" tab was literally screwed into the 1951 base.  This is an example from Marion County
(Courtesy Plateshack.com)
For 1953, a black-on-yellow "53" tab was screwed into the 1951 base.  This example is from Shawnee County
(From the collection of Mike Sells)
Kansas returned to all-new tags with the black-on-white 1954 series.  This tag is from Barton County
(From the collection of Mike Sells)
A white-on-black 1955 plate from Sedgwick county.  Note the high number :)
(From the collection of Mike Sells)
The black-on-white 1956 tag returned to the rectangular shape, with a state outline that would continued (with various colours) until the 1980 issue.  This plate is from Smith county.
(Courtesy Plateshack.com)
A red-on-white 1957 tag from Jewell county
(From the collection of Mike Sells)
A Yellow-on-blue 1958 tag from Washington County
(From the collection of Mike Sells)
A blue-on-orange 1959 tag from Reno county.