Reference Data
Rate Center Directory
KEYSTONE, SD Rate Center

KEYSTONE — SD

Data last updated: June 25, 2026

LATA
640
State
SD
Area Codes
1
Exchanges (NXX)
1
Carriers
1
Coordinates
43.8955709810876, -103.419098464731

Area Codes

605

Top Carriers

CarrierOCNNXX Count
FORT RANDALL TELCO DBA MT RUSHMORE TELEPHONE CO16601