and like in terms of regionality, rural representatives will always represent larger, more regionally diverse areas. My current rep represents a handful of Chicago suburbs (since around 66% of Illinoisians live in Chicago and its suburbs, that that grows every year). When I lived downstate, my rep represented a larger, more geographically diverse part of the state, in a district that gerrymandered its way through Rockford, the Quad Cities, Moline, and Peoria, covering a bunch of cornfields in between. It might not be the MOST geographically diverse district in the state, but it's definitely in the top 3 for geographical, agricultural, and settlement-pattern diversity. The 12th is probably the most "unlike the rest of Illinois" district in the state, as it has the Shawnee Forest and some non-glaciated areas (so weird!!!!), but it's also either all state/national park, or it's all super-rural corn farms. It's not actually all that diverse, although it's among the prettiest hiking in the state. There are a couple other very large, rural districts, but they tend to feature all the same types of farm and not a lot of diversity in landforms (or people). The rest of our districts are two districts gerrymandered to capture downstate blue-collar and college cities (East St. Louis, Chambana, B/N, Peoria, Moline) while letting rural Republicas have a couple of seats by having all the cornfields, or 13 of our 17 districts are pretty densely-packed into Chicago and the collar counties. I current live in one of the smallest districts in the state; I could drive across it in half an hour in traffic.

But yeah, I think 17 is probably the most geologically and geographically diverse district, with a lot of really interesting rust belt cities with different histories and different boom and bust moments. I'm just in the suburbs, my congressional district is made up almost entirely of schools in my kids' high school sports league; the district north of us is made up of the other half. That's just 12 high schools. It's dense here! And it's like all glacial morraines, it's pretty dull geographically. You go out to Rockford, you get the Rock River exposing some massively ancient rock formations, that's much cooler.

Your representatives represent about the same number of people as Illinois's do -- Cali is around 760,000 per rep. Texas is also right around 760k/rep.