Area Code 400 Phone Directory
Phone Numbers that start with (400) XXX-XXXX
Area Codes Starting with 4
- (400) xxx-xxxx
- (401) xxx-xxxx
- (402) xxx-xxxx
- (403) xxx-xxxx
- (404) xxx-xxxx
- (405) xxx-xxxx
- (406) xxx-xxxx
- (407) xxx-xxxx
- (408) xxx-xxxx
- (409) xxx-xxxx
- (410) xxx-xxxx
- (412) xxx-xxxx
- (413) xxx-xxxx
- (414) xxx-xxxx
- (415) xxx-xxxx
- (416) xxx-xxxx
- (417) xxx-xxxx
- (418) xxx-xxxx
- (419) xxx-xxxx
- (420) xxx-xxxx
- (421) xxx-xxxx
- (422) xxx-xxxx
- (423) xxx-xxxx
- (424) xxx-xxxx
- (425) xxx-xxxx
Major Cities in Area Code 400
- Rank:115
- Roanoke, VA
- Rank:90
- Syracuse, NY
- Rank:54
- Cleveland, OH
- Rank:48
- San Jose, CA
- Rank:40
- Baltimore, MD
- Rank:39
- Liverpool, NY
- Rank:34
- Orlando, FL
- Rank:32
- Atlanta, GA
- Rank:29
- Oklahoma City, OK
- Rank:24
- Lorain, OH
- Rank:22
- Omaha, NE
- Rank:19
- Baldwinsville, NY
- Rank:18
- Mesa, AZ
- Rank:18
- Salem, VA
- Rank:18
- Vinton, VA
- Rank:16
- Lincoln, NE
- Rank:16
- Beaumont, TX
- Rank:13
- Elyria, OH
- Rank:12
- Manlius, NY
- Rank:11
- Ashtabula, OH