Zip Code 95948 Description Zip Code 95948 is located in the state of California in the Chico - Redding metro area. Zip code 95948 is primarily located in Butte County. Portions of 95948 are also located in Sutter County. The official US Postal Service name for 95948 is GRIDLEY, California. Portions of zip code 95948 are contained within or border the city limits of Gridley, CA, Biggs, CA, . The area code for zip code 95948 is 530. 95948 can be classified socioeconically as a Lower Middle Class class zipcode in comparison to other zipcodes in California.