Cal. Gov. Code § 17520
"Special district" means any agency of the state that performs governmental or proprietary functions within limited boundaries. "Special district" includes a county service area, a maintenance district or area, an improvement district or improvement zone, or any other zone or area. "Special district" does not include a city, a county, a school district, or a community college district.
County free libraries established pursuant to Chapter 6 (commencing with Section 19100 of Part 11 of the Education Code, areas receiving county fire protection services pursuant to Section 25643 of the Government Code, and county road districts established pursuant to Chapter 7 (commencing with Section 1550) of Division 2 of the Streets and Highways Code shall be considered "special districts" for all purposes of this part.
Ca. Gov. Code § 17520