I can recommend 1989's fun DISORGANIZED CRIME
http://www.imdb.com/title/tt0097211/
to everyone willing to take an almost Ealing-esque comedy caper. Corbin Bernsen sends for 4 compatriates to hold up a small Montana town's bank, only to be captured by chasing FBI guys before his 4-some arrives. But they carry on with no plan, and Bernsen's escapes from his Keystone Kop Feds. Quite fun.
HIDE-OUT (1934, d-W. S. Van Dyke w/Robert Montgomery, Maureen O'Sullivan, Edward Arnold) has big-city gambler-gangster Montgomery holed up in the O'Sullivan family farmhouse. About 90% more romantic comedy than a caper film...
DESPERATE (1947, d-Anthony Mann; Steve Brody is the good guy, Raymond Burr as bad guy). Brody is tricked into letting his delivery truck be used in a cop-killing heist, then flees from Burr's gang out into the sticks. Raymond Burr can be such a vicious bad guy - I wonder what would happen if he ever bleached his hair out and wore specs? Ya think some neighbor would be watching him instead of Grace Kelly?!! Oh well... at least one movie director did.
What about BADLANDS (1973, d-Scorcese, Martin Sheen). This is more like a spree-killing travelog and may not fit in this collection, although there were certain Bonnie & Clyde wishes.
CHINA LAKE MURDERS (1990 w/Calif county sheriff Tom Skerritt trying to solve a few open highway murders, all committed by CHiPs motorcycle cop Michael Parks. This is almost OK CORRAL in its feel as the parties discover each other and dance around a while before settling matters. I guess I throw this one in mainly for its Death Valley location.
Another Psycho-In-Rural Clothing might be the Australian FORTRESS (1986, Rachel Ward)
http://www.imdb.com/title/tt0091069/
where Schoolmarm Rachel and her Outback 1-room-class are captured by some 'militants' for ransom and decide to fight back on their own. Not a great work but interesting, with a rather dashing end-of-film scene.
Fritz Lang's FURY (1936, Spencer Tracy) is about a lynch-attempt in a small town - probably only capable in such a rural community, too. No travelog here, everything is centered on this one small town. Probably not a good fit into this collection.
Small-town psycho-bully Dennehy's IN BROAD DAYLIGHT (1991) brings back Fortress, Fury and China Lake Murders, too, especially after last week's latest real-life crime drama around the same Skidmore, Missouri.
1953's HITCH-HIKER with popeyed William Talman as the psycho who never sleeps may or may not fit into this. A one-man terror isn't exactly my idea of this collection's parameters, but this and the same year's JEOPARDY (Barbara Stanwyck, hubby and son are taken hostage by escaped con Ralph Meeker) share this this cross-country terror spree.
IN COLD BLOOD? Hmmm... barely, but probably not.
While 1998's NEWTON BOYS qualifies on technicalities, I could easily never see it again.
WHITE HEAT (1949 Cagney) might fit in a lot of categories. Some rural settings for scenes, but the action is just about all Big-City.
And probably one that should fit is MA BARKER'S KILLER BROOD
http://www.imdb.com/title/tt0054041/
from 1961 with a nifty little performance by Ma Lurene Tuttle. She's usually seen shoplifting in The Andy Griffith Show, but KILLER BROOD puts her into a fairly strong (thought campy) performance.