The border of 585 area code roughly matches county lines (without regard to mailing address) which causes confusion where a Zip code overlaps a municipal boundary. Therefore, some Zip codes have phone numbers in either codes. Among these places: Arcade, Cuba, Akron and Alden. A significant part of Ontario County uses 315. Part of the town of Farmington is north of the NY Thruway (Interstate 90), and is "joined" with Wayne County in the 315 area code.