This brief calculates graduation rates for the state of Florida using longitudinal data. The authors describe their measurement strategies and compare them with the state's official measurement procedures. They calculate the diploma and General Education Development (GED) attainment rates of six separate cohorts of Florida 9th graders who began high school between 1995/96 and 2000/01. They then present rates of both diploma receipt and GED receipt at four years and in later years. The results show an increasing trend in graduation rates in the state over the period studied and a substantial bump at five years, with growth flattening out after that time. [This paper was written with Steven Cartwright.] (Contains 3 tables.)