IronWolf
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I'm loving Yggsburgh by E Gary Gygax, amazing stuff and it's only $24 on amazon.com - Amazon.com: Castle Zagyg Volume One: Yggsburgh (9781931275682): Gary Gygax: Books
It's a detailed city of 22,000 with 34x50 mile surrounding area heavily detailed. Has literally 1,000 adventures & adventure seeds. Stats are minimal, being for C&C. Will work great with any D&D variant. Culture is late medieval to Renaissance, like Greyhawk. It's awesome, and criminally underrated.
I'll second this recommendation. It is a good setting. I let my copy go awhile back when doing some purging and I regret having done so.