Campbell has a population of approximately 43,959 according to the 2020 United States Census. The city's population has remained relatively stable in recent years, reflecting a fully built-out suburban environment with limited space for outward expansion.
The community is demographically diverse. A significant portion of the population identifies as White, followed by a large Asian American community, and a robust Hispanic or Latino population. Campbell is known for having a highly educated populace, with a large percentage of adults holding bachelor's or advanced degrees. This heavily influences the local economy, as many residents are employed in management, business, science, and the arts—particularly in the surrounding tech sectors of Silicon Valley. Consequently, the median household income is well above the national average, though this is somewhat offset by the region's exceptionally high cost of living.