– phone area 605-666
📌Keystone, SD
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Area code 605-666 is assigned to Keystone, SD.

Main city: Keystone
Timezone: Central / Mountain
Phone type: Landline
Operator: Fort Randall Telco DBA Mt Rushmore Telephone Co

Keystone, a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 337 at the 2010 census. It had its origins in 1883 as a mining town, and has since transformed itself into a resort town, serving the needs of the millions of visitors to Mount Rushmore National Memorial, which is located just beyond city limits. source

North American Area code 605 is the telephone area code serving the entire state of South Dakota, and is one of the area codes that was created in 1947. It is also one of a gradually decreasing number of single-state, single LATA, single area code areas. (North Dakota uses only the 701 area code, but is split into two LATAs, one of which includes Minnesota.) source

Phone number full length is 10 digits: (605) 666-xxxx

International format length is 11 digits: +1 (605) 666-xxxx

Number can be also written as: 605-666, 605666, +1-605-666

Most requested numbers in the neighborhood:
605-666-5218, 605-666-2379, 605-666-4664, 605-666-9931, 605-666-1766