It must be the corny town name, which Maryland has in spades, or Arnold's distance from DC that makes people think of hicktown boondocks. From what I've seen, the only things growing in Arnold are babies, and lots of 'em. Watch yr speed!
As for town names, here's a list from a Zippy the Pinhead strip some years ago: Savage, Boring, Accident, Chance, Relay, Hurry, Detour, Mayo,
Fork, Gist, Parole, Monie, Sparks, Tuxedo, Bivalve, Crapo, Blueball, Pindell, Clopper, Pomonkey, Wango, Madonna, Halfway, Secretary, Morganza, Glenelg, Scaggsville, Frizzelburg, Zittlestown, Chewsvills, Finksburg, Funkstown, Ijamsville, Ladiesburg, Slabtown, Loveville, Gayfields, Mousetown, Spoolsville, Sugarland, Troutville, Girdletree, Fair Play, New Addition, Green Acres, Hack Point, Tonytank, One Spot, Pooks Hill, Radiant Valley, Random View, and of course Flintstone.
And don't forget California (across the Patuxent from Solomon's Island) and the three Oaklands.
