Headquarters
XO Communications
13865 Sunrise Valley Drive
Herndon, VA 20171
(703) 547-2021

XO Communications
3930 East Watkins Street
Suite 200
Phoenix, AZ 85034
602-324-6398

XO Communications
818 West 7th Street
Suite 980
Los Angeles, CA 90017
(213) 607-8000

1924 East Deere Ave
Ste. 110
Santa Ana, CA 92705
(949) 417-7158

3633 Inland Empire Blvd
Suite 145
Ontario, CA 91764
(909) 694-1100

XO Communications
5771 Copley Drive
San Diego, CA 92111
(858) 244-4000

XO Communications
1390 Lead Hill Blvd
Roseville, CA 95661
(916) 677-3000

XO Communications
855 Mission Court
Fremont, CA 94539
(510) 580-5800

12667 Alcosta Blvd
Suite 350
San Ramon CA 94583
(925) 807-1600

55 Almaden Blvd
Suite 700
San Jose, CA 95113
(408) 817-2800

651 Brannan St
Suite 310
San Francisco, CA 94107
(415) 901-3800

XO Communications
1660 Lincoln Street
Suite 2600
Denver, CO 80264
(303) 539-1200

XO Communications
3100 SW 145th Avenue, Suite 310
Miramar, FL 33027
(305) 670-5677

XO Communications
4700 Millenia Boulevard
Suite 320
Orlando, FL 32839
(321) 281-1030

XO Communications
5904 A Hampton Oaks Parkway
Tampa, FL 33610
(813) 301-4000
Tampa Bay Lightning

XO Communications
4000 Highlands Parkway SE
Smyrna, GA 30082
(678) 444-4444

XO Communications
810 Jorie Boulevard
Oak Brook, IL 60523
(630) 371-3100

233 South Wacker, 35th Floor
Chicago, IL 60606
(312) 377-1000

XO Communications
1302 Concourse Dr
Suite 200
Linthicum, MD 21090
(443) 891-2367

XO Communications
1601 Trapelo Road, Suite 397
Waltham, MA 02451
(781) 693-3900

XO Communications
21555 Melrose Ave, Suite 7
Southfield, MI 48075
(248) 415-5900

XO Communications
1200 Washington Avenue North
Minneapolis, MN 55401
(612) 338-7977

XO Communications
2020 Westport Center Dr
St. Louis, MO 63146
(314) 787-7000

XO Communications
2240 Corporate Circle
Suite 100
Henderson, NV 89014
(702) 990-1000

XO Communications
4350 Haddonfield Road
Suite 102
Pennsauken, NJ 08109
(856) 773-5000

XO Communications
40 Wall Street, 16th floor
New York, NY 10005
(646) 443-9700

XO Communications
Two Easton Oval
Suite 300
Columbus, OH 43219
(614) 629-3200

XO Communications
3 Summit Park Dr
Suite 750
Independence, OH 44131
(216) 619-3200

XO Communications
9000 SW Nimbus Ave.
Beaverton, OR 97008
(503) 277-1400

XO Communications
370 Woodcliff Drive
Suite 105
Fairport, NY 14450
(585) 267-4400

XO Communications
974 Marcon Blvd.
Suite 140
Allentown, PA 18109
(610) 862-5200

XO Communications
991 Peiffers Lane
Harrisburg, PA 17109
(717) 441-9904

XO Communications
1220 Broadcasting Road
Wyomissing, PA 19610
(610) 288-5363

XO Communications
555 North Lane
Suite 6020
Conshohocken, PA 19428
(610) 862-5200

XO Communications
2100 South I-35
Austin, TX 78704
512-692-1000

XO Communications
1300 West Mockingbird Lane
Suite 200
Dallas, TX 75247
(214) 237-7700

XO Communications
2401 Portsmouth
Houston, TX 77098
(832) 200-2069

XO Communications
1030 Central Parkway South
San Antonio, TX 78232
(210) 587-0100

XO Communications
5127 Truse Road
Memphis, TN 38117
(901) 888-8888

XO Communications
105 Molloy Street
Suite 300
Nashville, TN 37201
(615) 777-7777

XO Communications
7050 Union Park Center
Suite 400
Midvale, UT 84047
(801) 983-1600

XO Communications
1000 Denny Way
Suite 200
Seattle, WA 98109
(206) 315-5055

XO Communications
1330 N. Washington Avenue
Suite 5000
Spokane, WA 99201
(509) 444-8500

XO Communications
4301 Connecticut Ave
Mezzanine – 3
Washington, DC 20008
(202) 207-9904

XO Communications Allegheny Center Mall
Suite 03
Pittsburgh, PA 15212
(412) 535-7250

XO Communications
301 S. McDowell
Charlotte, NC 28204
(980) 422-9696

XO Communications Raleigh

(877) 967-2562