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The flag of Miami-Dade County was adopted on February 17th, 1981, and modified sometime in 1997. It features the Miami-Dade County seal adopted in 1997 (originally 1957) centered on a saltire of turquoise and green.

History
Miami-Dade county has posessed two other official flags throughout its history;

Proposals
In 1963, after the 1952 flag was shelved upon the restructuring of the county's government, the County Planning Department was tasked with making a proposal. Their proposed flag consisted of three vertical bands of turquoise, green, and yellow, with the county seal in the middle.