Newcastle, California Zip Codes
📍 Newcastle is in Placer County, California with 1 zip code; the most populous is 95658.
Newcastle is a USPS city name in Placer County, California with a Census population of approximately 5,974 across its ZIP codes. Placer County as a whole has 30 ZIP codes in this directory. Below you'll find every zip code serving Newcastle with population, income and home value, a map, and the city's affordability profile.
Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).
All Newcastle Zip Codes
Newcastle at a Glance
Newcastle has 1 ZIP code in this directory: 1 standard delivery ZIP. The 1 ZIP with published Census housing data cover 5,974 residents, the largest being 95658 with 5,974 people.
The median ZIP in Newcastle has a household income of $117,118 and a home value of $786,500, a price-to-income ratio of 6.7, in line with the 6.7 California ZIP median. Median rent across these ZIPs is $1,456 a month.
90% of households in the typical Newcastle ZIP own their home (statewide ZIP median 64%). 39% of adults hold a bachelor's degree, above the 31% statewide median. The median poverty rate is 3.2%, far below the 10.8% statewide ZIP median. Overall density is about 256 residents per square mile across 23 square miles of ZIP land area.
Medians are taken across the ZIP codes listed below (each ZIP weighted equally); PO Box and no-data ZIPs are excluded. Definitions on the methodology page; statewide comparisons in the 2026 California ZIP Code Affordability Report.
Newcastle Zip Code Map
Interactive map of Newcastle, California zip codes. Click any marker for details.