After cutting through downtown Westfield, CR 509 passes Fairview Cemetery on the right before coming to an intersection with CR 577 (Springfield Avenue), which splits off to the left before banking due north toward Mountainside, Springfield and U.S. Route 22 (US 22). CR 509 turns right onto Springfield Avenue but quickly becomes Kenilworth Boulevard. For less than a mile, the route passes through Cranford, during which time County Route 615 splits off to the right. It crosses into Kenilworth, where it is signed simply as "Boulevard" while traveling nearly due east. (East Broad Street continues straight as Nomahegan Drive for less than a mile before coming to a dead end).