Wanted to add that you could also do a search here on the forum for a particular world. Usually with the release of a new world we have a detailed thread with info on size, lots, etc.
For instance here's the discussion on Tartosa, the world that came with My Wedding Stories.
https://forums.thesims.com/en_US/discussion/997242/tartosa-world-discussion-thead/p1
Copperdale- High School Years
https://forums.thesims.com/en_US/discussion/1000944/the-copperdale-world-discussion-thread/p1
Moonwood Mills- Werewolves
https://forums.thesims.com/en_US/discussion/1000098/moonwood-mills-discussion-thread/p1
