Area codes 318 and 457

Area codes 318 and 457 are telephone area codes that cover northern and central Louisiana. 318 was overlaid by 457 in 2025.

Its headquarters and largest city in Shreveport, is the parish seat of Caddo Parish.

Largest City with Parish seats

Cities Top-20 Parish Seat

#	City	Parish	Class of City	Population 2010
1	Shreveport	Caddo/Bossier	3rd	199,311
2	Monroe	Unknown	8th	48,815
3	Alexandria	Rapides	9th	47,723
4	Ruston	Linclon	14th	21,859
5	Natchitoches	Natchitoches	17th	Example
6	Minden	Webster	Unknown	Example
7	Bastrop	Morehouse	Example	Example
8	DeRidder	Beauregard/Vernon	Example	Example
9	Tallulah	Madison	Example	Example
10	Leesville	Vernon	Example	Example
11	Mansfield	DeSoto	Example	Example
12	Winnsboro	Franklin	Example	Example
13	Winnfield	Winn	Example	Example
14	Jonesboro	Jackson	Example	Example
15	Vidalia	Example	Example	Example
16	Lake Providence	East Carroll	Example	Example
17	Farmerville	Union	Example	Example
18	Rayville	Richland	Example	Example
19	Jena	La Salle		Example
20	Homer	Claiborne	Example	Example