Miami-Dade County was established on January 18, 1836 as Dade County. The name was changed to Miami-Dade County in 1997 by public vote.
2004–present[]
When the county consolidated 9 privately-owned local bus companies into a countywide transit system in the 1970s, all the lines kept their differing color schemes. Thus, in 1978 the county council decided on and approved a unified color scheme: blue (for South Florida's proximity to ocean), white and green (for its abundant foliage). By the 1990s, some county government departments had the white, blue & green color scheme, but most departments used various other different color schemes. In November 2003, the County Commissioners voted on a unified logo for most departments. The final logo was approved for official use on April 13, 2004, and implemented on May 11 that year.