| City: | Pasadena, California |
| Names to Avoid: | Kaiser Foundation Health |
| County: | Los Angeles County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 10:03:10 PM |
| Population: | No Population Data |
| Area Codes: | 323 / 626 / 738 |
| Classification: | Unique [Company/Government] |
| Coordinates: | 34.1504, -118.1422 |
| Quick Link: |
Kaiser Foundation Health Plan operates a major facility under dedicated ZIP code 91188 in Pasadena, Los Angeles County. Kaiser Permanente, one of America's largest nonprofit integrated health care providers, was founded in 1945 by industrialist Henry J. Kaiser and physician Sidney R. Garfield. The organization traces its origins to 1933 when Dr. Garfield established a small hospital in Desert Center, California to treat workers building the Colorado River Aqueduct. The name Permanente comes from Permanente Creek, which flowed past Kaiser's cement plant on Black Mountain in Cupertino. This unique postal designation has served the facility for over two decades.
The compact 0.01-square-mile Pasadena facility in the West Central neighborhood on Walnut Street employs approximately 1,926 workers according to Census Business Patterns data. Postal records identify 22 ZIP+4 codes routing to the Kaiser Foundation location, indicating substantial administrative and member correspondence volume. Kaiser Permanente serves approximately 12.7 million members across eight states and Washington D.C., making it one of the nation's largest health maintenance organizations. Census demographic data is not available for this commercial designation. Pasadena serves as the valid mailing city.
| Establishments: | 7 |
| Employment: | 1,926 |
Buildings registered in the USPS ZIP+4 database with designated codes for direct mail delivery.
ZIP Code 91188 supports both business and residential activity. According to the Business Census (2024), there are 7 business establishments, employing about 2,177 people with an annual payroll of $342,744,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 0Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 7Source: CBP |
| 1st Quarter Payroll: | $92,616,000Source: CBP |
| Annual Payroll: | $342,744,000Source: CBP |
| # of Employees: | 2,177Source: CBP |
ZIP Code 91188 is located in Los Angeles County, California, within the Los Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area (CBSA 31080) and California's 28th Congressional District. This Metro area has a population of 13,012,469 people, about 0.00% of whom live in ZIP Code 91188, and is subdivided into the Los Angeles-Long Beach-Glendale, CA division. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Los Angeles-Long Beach-Anaheim, CASource: Census |
| CBSA Number: | 31080Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | Los Angeles-Long Beach-Glendale, CA (CBSA Div 31084)Source: Census |
| CBSA Population: | 13,012,469Source: Census |
| MSA: | Los Angeles-Riverside-Orange County, CASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 28Source: USPS |
| Congressional Land Area: | 218.45 sq miSource: Census |
| PMSA: | Los Angeles-Long Beach, CA PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0656000Source: Census |
| Place Name: | Pasadena city; CaliforniaSource: Census |
We could not locate which school district 91188 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on January 1, 2026.