For a bit of contrast, I live close to Lancaster, PA. About half of the people in that area pronounce it "LAN-kister" and the other half "Lang-CASTer". And each side tries to correct the other. I'm happy to pronounce it however they like. I just think they should get it resolved internally and come to a consensus before they tell ME how to say it. Come to an agreement and tell me what the agreement was. I'll do THAT! LOL!
When I lived in Dallas I had friends that lived in nearby Lancaster, TX. I always pronounced it LangCASTer because of the actor, Burt. Took me a long time to their pronunciation of LANkister or even more truncated LANKster.
It’s like HOWston street in NYC. Umm, isn’t that Houston - HUEstun.