Home / Area 240 / Prefix 399
Prefix Lookup

(240) 399 Phone Number Lookup

Research phone numbers under this exchange in Washington, Maryland. Review carrier details, activity signals, and community caller feedback.

199number listings
0caller reports
12lookup pages

Phone Numbers in This Prefix

Browse numbers in this exchange and open any listing to view caller details, spam signals, and community feedback. Showing 1–18 of 199 listings for this prefix.

New listing Landline

(240) 399-4734

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4754

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4774

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4794

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4814

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4834

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4854

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4874

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4894

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4914

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4934

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4954

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4974

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-4994

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-5014

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-5034

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-5054

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing
New listing Landline

(240) 399-5074

Washington, Maryland

  • Carrier: Xo Maryland Llc
  • Exchange: 240-399
  • Report type: Reverse lookup profile
View listing

About this prefix

Area code 240 prefix 399 is organized as a reverse lookup section for Washington, Maryland. The page combines location metadata, carrier information, line type, number listings, and community activity in one place.

Public URLs use the exchange format 240-399, while each listing still maps back to the correct area code and prefix structure.