"NANP Area Code History: 1970 - 1979," from areacode-info.com https://web.archive.org/web/20021103220018/http://www.areacode-info.com/!history/1970s.htm
"Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)" (PDF). North American Numbering Plan Administrator. January 8, 2021. Retrieved March 9, 2021. https://nationalnanpa.com/pdf/PL_556.pdf
Ress, Dave (16 November 2022). "SCC approves additional area code for Virginia's 804 region". Richmond Times-Dispatch. Retrieved 2022-11-16. https://richmond.com/news/state-and-regional/scc-approves-additional-area-code-for-virginias-804-region/article_47131017-97d3-5d73-80cf-e525116ac01e.html
"SCC Approves New Area Code for Central Virginia and Northern Neck; NANPA Assigns new 686 Area Code to Relieve Exhaustion of 804". State Corporation Commission. November 22, 2022. Retrieved November 22, 2022. https://www.scc.virginia.gov/newsreleases/release/SCC-OKs-New-686-Area-Code
"Planning Letter PL-608 – NPA 686 and 804 All-Services Overlay (Virginia)" (PDF). NANPA. 2023-01-09. Retrieved 2023-01-14. https://www.nationalnanpa.com/planning_letters/PL_608.pdf