Union’s proud tradition began with its formation in 1919 when four rural communities – Alsuma, Boles, Mayo and McCollough – consolidated.
There were only four students in its first graduating class. Union’s original borders were much broader, extending as far northwest as 21st Street and South Yale. Those portions, however, were annexed by the Tulsa Public School District in the 1950s, making Union’s current northwest border 31st and Mingo Road.
During the next 20 years, enrollment gradually increased and new programs were added. Then, Tulsa’s development rapidly spread toward the southeast, leading to new office and home construction and a burst of growth for Union. In 1968, there were 800 students in the entire district. In 1995, that number grew to 11,500 and to more than 14,000 in 2010.