One exception to this rule is the city of Elwood, which retained the 913 area code while the rest of Doniphan County switched to 785. This is because Elwood's servicing wire center is in St. Joseph, Missouri, which is part of the Kansas City, Missouri LATA, located in area code 816. It would have been too expensive for Southwestern Bell to reroute Elwood's trunk lines so it could follow the rest of Doniphan County into 785. All bordering 816/913 rate centers have each other's area codes.