Walnut, California

Walnut, California, in Los Angeles County, has ZIP codes 91788 and 91789 and area code 909, with 840 as an overlay.

ZIP codes: 91788, 91789
Area codes: 909, 840
County: Los Angeles County
State: California
Time zone: Pacific Time
Coordinates: 34.0193, -117.8599

ZIP codes in Walnut

ZIP code	Post office	County	Area codes
91788^*	Walnut	Los Angeles County	909, 840
91789	Walnut	Los Angeles County	909, 840

* No mapped delivery area: P.O. boxes or a single organization. Area codes are those of the nearest ZIP code area.

Area codes for Walnut

Area code 909
In service since November 14, 1992. Shares its area with 840. Local calls are dialed with 1 plus ten digits.
Area code 840
In service since February 23, 2021. Shares its area with 909. Local calls are dialed with 1 plus ten digits.

Area codes here are matched from telephone rate centers, so a place near a boundary can have local numbers from either side of it.

Time zone

Walnut is in the Pacific Time zone.

Towns near Walnut

South San Jose Hills4.2 km (2.6 mi)
Diamond Bar4.8 km (3.0 mi)
Rowland Heights5.4 km (3.4 mi)
West Covina6.7 km (4.2 mi)
Valinda6.9 km (4.3 mi)
Industry7.4 km (4.6 mi)
Covina8.4 km (5.2 mi)
La Puente8.9 km (5.5 mi)

Local numbers in area code 909

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