SANTA MONICA, Calif. — Fresh blotches of graffiti decorate the backs of street signs here near the ocean. Tags have popped up on guardrails along the dirt trails near Griffith Park across town. There are, almost daily, fresh splashes on walls in the San Fernando Valley, on downtown Los Angeles buildings and on billboards along the highways.

And Los Angeles does not appear to be alone in grappling with a recent upsurge in graffiti, which is turning up in some unlikely places. A bumper crop of scrawls is blossoming in many modest-size communities across the country — in places like Florence, Ala.; Bernalillo County, N.M.; Taylors, S.C.; and in larger cities like Nashville and Portland, Ore. — even as major cities like Chicago, Denver, New York and Seattle say vigilant antigraffiti campaigns have spared them thus far.

“It’s popped up all of a sudden in the last six months,” said Tim Sandrell, the owner of Safari Adventures in Hair in Florence. “I’ve been downtown for 10 years, and I’m really disappointed that we are seeing this kind of activity. We have a beautiful city and an historic city, and it’s really upsetting to me seeing this going on.”