Residents in Miami-Dade County (FL) who don't have health insurance can sign up for a new plan aimed at helping the estimated 600,000 uninsured in the county. Called Miami-Dade Blue, the program went into effect July 1 and is a joint venture between the county and Blue Cross and Blue Shield of Florida. Miami-Dade officials estimate there are 600,000 uninsured people countywide. Of those, 80% work but cannot afford health coverage.