 |
 |
| city/area | all listed phonenumbers of landlines should be in the |
country
code
or national long distance direct dial code |
area
code
or NPA (Numbering Plan Area) |
exchange
(Central Office) number |
line
number
each Central Office can have up to 9999 lines numbered from 0000 to 9999 |
important
|
| Oak Lawn | Phonebook
of Illinois.c m |
+I
|
708
|
- - -
|
- - - -
|
|
| Oak Park | Phonebook
of Illinois.cm |
+I
|
708
|
- - -
|
- - - -
|
|
| Oakland | Phonebook
of California.cm |
+I
|
5I0
|
- - -
|
- - - -
|
|
| Ocala | Phonebook
of Florida.cm |
+I
|
352
|
- - -
|
- - - -
|
|
| Oceanside | Phonebook
of California.cm |
+I
|
760
|
- - -
|
- - - -
|
|
| Odessa | Phonebook
of Texas.cm |
+I
|
9I5
|
- - -
|
- - - -
|
|
| Oklahoma City | Phonebook
of Oklahoma.cm |
+I
|
405
|
- - -
|
- - - -
|
|
| Olathe | Phonebook
of Kansas.cm |
+I
|
9I3
|
- - -
|
- - - -
|
|
| Omaha | Phonebook
of Nebraska.cm |
+I
|
402
|
- - -
|
- - - -
|
|
| Orlando | Phonebook
of Florida.cm |
+I
|
32I
|
- - -
|
- - - -
|
|
| Orlando | Phonebook
of Florida.cm |
+I
|
407
|
- - -
|
- - - -
|
|
| Oshkosh | Phonebook
of Wisconsin.cm |
+I
|
920
|
- - -
|
- - - -
|
|
| Ottawa | Ontario/ON Canada |
+I
|
6I3
|
- - -
|
- - - -
|
|
| Overland Park | Phonebook
of Kansas.cm |
+I
|
9I3
|
- - -
|
- - - -
|
|
| Owensboro | Phonebook
of Kentucky.cm |
+I
|
270
|
- - -
|
- - - -
|
|
| Oxnard | Phonebook
of California.cm |
+I
|
805
|
- - -
|
- - - -
|
|
|
or
O
for Operator |
||||||
 |
the
US telephone system: orginally and before the divestiture of AT&T into 22 Baby Bells in I984 Us area-codes were rather simple,.. |
...from
200 - 900
and |
restricted
to the first I9 n°s
in a given series example 200 - 2I9 300 - 3I9 |
|
|
codes
out of this
dialing schemes are recent |
m