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zip code 45245 has 30 courses within the search results, but you didn't specify: one of those is extinct, one is an old layout (so, extinct), and one is a temporary course. But then, a new one is opening in the next month. I've played them all despite starting disc golf just last September (well, I'll be playing tournaments on the temp and the new course by August, anyway). Oh, and 14 of them are rated 2.5 or higher...
Mine Round Lake, IL--60073--42 courses
Lombard, IL 60148--54 courses. Every time we ran an event there the event filled all 20 holes with 5 somes both days. Right in the middle of all the Chicago scenes.