>>149205202Yes, all library can participate in this system, but even in a well-founded library system like mine, any loans that are from outside our system, we (the patrons) need to pay for that loan - it still costs the library system money, if nothing else, the postage or shipping costs/fees. And since some library systems are starved, intentionally so, they don't have even money for the things that normally don't charged to patrons so often that's not even offered.
Also, libraries are a city system, they may have a county system if the cities are too small, in which case you are right (my urban area has both covering some of the same areas, but my urban area is about 50+ cities including the large metro). State systems would be your colleges and universities. And they don't lend out to non-students, non-researchers, etc., other than the same inter-library loan system, and their stuff tends not to travel since it's more restricted. None of the USA states participates in a state (or province) system-wide library other than their post secondary education systems which are connected - this State Colleges of New York or the Texas State colleges or the University of California system, etc.