States

ABA in California

The federal NPI registry lists 1,592 organizations in California carrying the Behavior Analyst taxonomy code — 7.9% of the national total.¹² 37 multi-location companies operate here, between them holding 69 of those registrations.¹ 10,734 BCBAs are certified to a California address — 12.8 per 10,000 children, against 10.3 nationally.³⁴

Companies operating in California

Companies with three or more registered locations nationally that have at least one in California. "Here" counts their California registrations; "total" counts all of them.¹

Where they are

The 20 California cities with 15 or more registered organizations each have their own page.¹

Everywhere else in California

Every organization registered here under the Behavior Analyst taxonomy code, 1,021 in all. Street addresses are not listed — a company with one or two registrations may be run from a home. Each row links to its own record in the federal registry, which carries the address.¹

Sources

1. CMS — NPPES Data Dissemination, where the monthly full replacement files are published. File used: npidata_pfile_20050523-20260712.csv.file dated 12 July 2026; downloaded 2 August 2026. CMS replaces this page's listing each month, so it shows the current file rather than this one.
2. NPI Registry public API — organizations carrying taxonomy 103K00000X, Behavior Analystqueried 2 August 2026. Returns JSON.
3. Behavior Analyst Certification Board — certificant data dashboardretrieved 2026-08-01
4. U.S. Census Bureau — Population Estimates Program, state population by age and sexreference date 2024-07-01