When we moved to Idaho we found we didn’t have much of a flea problem (we have cats). But in areas of “congestion” they are still an issue.
I lived in San Mateo, CA for a few years (late 80 to early 90s). One of the main roads through the nicer part of town is called “Alameda de las Pulgas.” Avenue of the fleas. Yes, they were a problem there.
One of the main roads in East Palo Alto is just called “Pulgas.”