Pretty much any suburbs south of Denver. Douglas County will be good. I don't think a single sheriff in the state supported the mag cap law, but STAY AWAY from Denver proper.
The city of Centennial (where I live) itself is very conservative, and has Cherry Creek school district which is the best in the state (Cherry Creek and Grandview HSs), some Douglas county HSs not too far behind. Unfortunately its part of Arapahoe County. Avoid Denver, avoid Aurora as they are full of pot shops. There are some out door ranges around this area out east, and indoor ranges.
A couple of national forest places for shooting are about an hour's drive away into the mountains (much closer than Fairplay). One good for pistol, right off a major road. At a certain point another needs 4wd but has multiple areas you can set up 500m+ if you want.
Ken Karyl, Evergreen, Conifer/Aspen Park I think would be fine as well and put you in/against the mountains and very close to these 2 areas.
Boulder county is hugely split between a conservative element and the rabit leftists. The rabid leftists outnumber the conservatives, nuff said.
Denver Tech Center is Greenwood Village and Centennial, anything but leftist/communist. Quite a few gun stores in that area as well.