From 1975 until 1982, the Volvo 240 was the only Volvo sold in the United States. You'll see a lot more of these cars on the road today than just about any other car from that era, a credit to the 240's reliability. 200,000 miles is not a great achievement with these cars, it's just about the standard. It would take at least 400,000 miles on a 240 to impress me.
Aside from being reliable, the Volvo 240 was also just about the safest vehicle on the road. Crumple zones and 3 point safety belts were standard on the 240 during a time when most other car companies hadn't even experimented with them. The 240 had the lowest death rate of any car from 1990 until 1993.
The variations on the 240 include the 242L, 242DL, 244DL, 244GL, 245L, and 245DL.
The 200 Series was sold with a variety of engines, ranging from the Volvo red block 4 cylinder engines up to a diesel I6. Another engine, the 6 cylinder PVR, was also used in the DeLorean DMC-12.
Some trim levels on the Volvo 200 Series include the Transport, Polar, Super Polar, SE, Classic, and Limited. Those were the "special trim" levels, which complimented the regular trim levels of L, DL, GL, GLE, GLT, and GT.
Finding a used Volvo 240 is not a very hard task. So many of these cars were sold during the lifespan of the model and such a high number of them have survived that they are fairly common cars despite having been discontinued 15 years ago. The first place you should look if you want to buy a Volvo 240 is on eBay, where you can also find parts that you might need to fix one.