With immigration reform in the news, I was interested while testing my AM Towers USA iPhone app how many AM radio stations serve the Spanish market in Minneapolis. So I took a few minutes to use my apps to generate some images of Spanish format (Spanish, Spanish Talk, Mexican, Latino, Salsa...) radio formats in the USA. FCC data, mixed with formats reported on Wikipedia indicate there are 289 FM stations serving up Spanish market programming in the United States+Puerto Rico.
And 268 AM stations.
These were generated using my AM Towers USA and FM Towers USA apps running in the iPad simulator, but I did tweak the code temporarily to allow so many stations to be displayed at once.