Is Calabasas in Los Angeles County or Ventura County? ZIP Code Guide

County Jurisdiction

Answering the question is Calabasas in LA County, the city is an incorporated municipality located entirely within Los Angeles County, California — it has been fully incorporated since 1991 and spans roughly 13.7 sq mi.[source]

The city of Calabasas Los Angeles County sits in the southwestern foothills of the San Fernando Valley and the Santa Monica Mountains, right before the Conejo Grade that marks the edge of the Ventura County line.[source]

At the Calabasas Ventura County border, neighboring towns such as Agoura Hills and Hidden Hills also remain inside Los Angeles County, reinforcing that all legal, municipal, and postal oversight for Calabasas is administered by Los Angeles County authorities.

Calabasas ZIP Code Overview

The City of Calabasas operates under a concise postal system that centers on three ZIP codes. The primary residential and commercial zone, 91302 Calabasas, covers nearly every home address, business address, and major retail centre such as The Commons. This code routes the bulk of daily mail through the Los Angeles County postal network, delivering directly to street addresses across the city’s 15 sq mi.

The dedicated post‑office‑box identifier, 91372, is assigned to the Calabasas Post Office located at the Park Sorrento facility. All PO boxes in the city use this ZIP code, allowing the Calabasas Postal Service to separate bulk box mail from street‑level delivery for more efficient sorting.

Bordering communities, most notably Agoura Hills, fall under 91301. While the 91301 code primarily serves Agoura Hills, it also captures a few western parcels that sit on the municipal edge of Calabasas, creating a small overlap for residents whose mailing address falls just inside the city limits.

• 91302 Calabasas – Main citywide ZIP code for homes, businesses, and schools.

• 91372 – PO box ZIP code for the Calabases Post Office (Park Sorrento).

• 91301 – Adjacent ZIP code serving Agoura Hills and border tracts touching Calabasas.

USPS routing in the southwestern San Fernando Valley follows a hub‑and‑spoke model. Mail destined for 91302 Calabasas is first processed at the Los Angeles County sorting facility, then dispatched to local carrier routes that fan out across the city’s residential neighborhoods and commercial corridors. PO box items labeled 91372 are routed directly to the Park Sorrento post office, where they are held for customer pickup. Items with the 91301 designation are handled by the nearby Agoura Hills station before final delivery to the overlapping Calabasas parcels.

For a visual reference, consult the Calabasas ZIP code map which delineates the boundaries of each code within the city's limits and adjacent areas.

Western Boundary Overview

Calabasas sits at the western edge of Los Angeles County, where the San Fernando Valley border meets the foothills of the Conejo Valley. The city is officially incorporated within Los Angeles County — a fact confirmed by multiple municipal records 【FINDING 3】.

San Fernando Valley Border

To the east, Calabasas blends into the southwestern portion of the San Fernando Valley, sharing the same county jurisdiction and many of the valley’s suburban characteristics. This continuity often leads residents and visitors to assume the area spills into neighboring counties.

Conejo Valley Calabasas

The western side of Calabasas slopes into the Conejo Valley, a region more commonly associated with Ventura County communities such as Agoura Hills and Westlake Village. Because the valley’s cultural and environmental identity extends across the county line, the Conejo Valley Calabasas area is sometimes mistakenly linked to Ventura County.

Ventura County Line Calabasas

Traveling west on U.S. 101, drivers pass through Agoura Hills and Westlake Village before crossing the official Ventura County line into Thousand Oaks and Oak Park — areas that sit entirely within Ventura County 【FINDING 5】. This clear shift in jurisdiction is the Ventura County line at Calabasas, but the transition can feel subtle on the ground, especially since the built‑environment and school districts blend across the border.

Why the Confusion?

• Shared Services: Some municipal services, such as fire‑protected parcels and school district boundaries, overlap between Los Angeles and Ventura counties, blurring the line for residents.

• Environmental Continuity: The open‑space preserves and hills that dominate Calabasas continue seamlessly into Ventura County, creating a unified natural landscape.

• Cultural Overlaps: Community events, local businesses, and the “Town Circle” professional network often serve audiences on both sides of the county line, reinforcing the perception of a single regional community.