> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/naics/561311/california/ # NAICS 561311 companies in California Companies with NAICS code 561311 (Employment Placement Agencies) headquartered in California, with their cities, sizes and SIC codes. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** The biggest NAICS 561311 companies in California by headcount range include Idc Technologies, Trinet and Partners Personnel. NAICS 561311 is the code for Employment Placement Agencies. Among those counted, they are mostly small: 68% have 200 or fewer employees. ## Which NAICS 561311 companies are in California? The biggest by headcount range include Idc Technologies, Trinet, Partners Personnel, Medical Professionals and It-Scient. NAICS 561311 is the code for Employment Placement Agencies. Names link to a company profile where we have one. | Company | City | Employees | | --- | --- | --- | | Idc Technologies | Milpitas | 5,001 to 10,000 | | Trinet | Dublin | 1,001 to 5,000 | | Partners Personnel | Santa Barbara | 1,001 to 5,000 | | Medical Professionals | San Diego | 1,001 to 5,000 | | It-Scient | Fremont | 1,001 to 5,000 | | Skillsetgroup | Santa Ana | 1,001 to 5,000 | | Employnet | Monterey | 1,001 to 5,000 | | Childcare Careers | Brisbane | 1,001 to 5,000 | | Ultimate Staffing | Orange | 501 to 1,000 | | Atr International | Santa Clara | 501 to 1,000 | | Pts Advance | Tustin | 501 to 1,000 | | Jwilliams Staffing | Irvine | 501 to 1,000 | | Kinetic Personnel Group | Riverside | 501 to 1,000 | | Epic Personnel Partners | Pleasanton | 501 to 1,000 | | Newegg Staffing | City Of Industry | 501 to 1,000 | | Readylink | Thousand Palms | 501 to 1,000 | | Scion Staffing | San Francisco | 201 to 500 | | Ledgent | Orange | 201 to 500 | | Infosoft | Gilroy | 201 to 500 | | Civicminds | Stanton | 201 to 500 | | Alpha Silicon | Santa Clara | 201 to 500 | | Talentful | San Francisco | 201 to 500 | | Synergisticit | Fremont | 201 to 500 | | Job Mobz | San Francisco | 201 to 500 | | Tekberry | Santa Rosa | 201 to 500 | The table shows the 25 biggest by headcount range, with ties broken by audience size. The charts and percentages below cover every company counted for this page, not just these 25, and companies with fewer than 11 employees are not counted. Headquarters is the location on each company's public profile. ## Which cities in California? Within California, San Francisco (7%), Santa Clara (6%) and Los Angeles (5%) are the most common headquarters. **Figure: Cities of NAICS 561311 companies in California.** Bars for the share of counted NAICS 561311 companies in California headquartered in each city: San Francisco 7%, Santa Clara 6%, Los Angeles 5%, San Diego 5%, San Jose 5%, Fremont 3%, Irvine 3%, Pleasanton 3%. *Share of counted NAICS 561311 companies in California by headquarters city.* ## How big are they? 36% of the NAICS 561311 companies counted in California have 50 or fewer employees, and the middle one is in the 51 to 200 range. Companies with fewer than 11 employees are not counted. **Figure: Size of NAICS 561311 companies in California.** Seven columns for the share of counted NAICS 561311 companies in California in each employee range: 11 to 50 36%, 51 to 200 32%, 201 to 500 18%, 501 to 1,000 7%, 1,001 to 5,000 6%, 5,001 to 10,000 1%, 10,001+ 0%. *Share of counted NAICS 561311 companies in California in each employee range.* ## How old are they? Most were founded in the 2010s (34%), then the 2000s (27%). **Figure: When NAICS 561311 companies in California were founded.** Eight columns for the share of counted NAICS 561311 companies in California founded in each era: Before 1960 0%, 1960s 0%, 1970s 1%, 1980s 11%, 1990s 20%, 2000s 27%, 2010s 34%, 2020s 7%. *Share of counted NAICS 561311 companies in California by the era they were founded in, for the ones that list a founding year.* ## How California compares with the rest of the country - 36% of NAICS 561311 companies in California have 50 or fewer employees, against 48% across NAICS 561311 companies nationwide. ## How do you reach the people at these California companies? The people to talk to are usually operations, HR and finance leaders. Build the list in three prompts to your AI agent. ### 1. Count them (free) Counting who matches never uses credits. ```text Use www.enrich.chat to count the companies with NAICS code 561311 in California ``` ### 2. Find the people (5 credits per person) Name the roles you sell to. Each person returned is 5 credits, and name, title and company are included. ```text Use www.enrich.chat to find the operations, HR and finance leaders at companies with NAICS code 561311 in California, with their titles ``` ### 3. Get their work emails (10 credits each) An email is 10 credits only when one is found. Every email comes with a status: verified, catch-all or unknown. ```text Use www.enrich.chat to find the work emails for these people and tell me which ones are verified ``` ## More to explore About the code: [NAICS 561311: Employment Placement Agencies](https://enrich.chat/naics/561311/). About the place: [companies in California](https://enrich.chat/companies-in/california/). NAICS 561311 in other states: [Texas](https://enrich.chat/naics/561311/texas/)[Florida](https://enrich.chat/naics/561311/florida/) Other NAICS codes in California: [NAICS 541511: Custom Computer Programming Services](https://enrich.chat/naics/541511/california/)[NAICS 541512: Computer Systems Design Services](https://enrich.chat/naics/541512/california/)[NAICS 722511: Full-Service Restaurants](https://enrich.chat/naics/722511/california/)[NAICS 541613: Marketing Consulting Services](https://enrich.chat/naics/541613/california/)[NAICS 238220: Plumbing, Heating, and Air-Conditioning](https://enrich.chat/naics/238220/california/)[NAICS 513210: Software Publishers](https://enrich.chat/naics/513210/california/)[NAICS 531210: Offices of Real Estate Agents](https://enrich.chat/naics/531210/california/)[NAICS 524210: Insurance Agencies and Brokerages](https://enrich.chat/naics/524210/california/)[NAICS 236220: Commercial and Institutional Building](https://enrich.chat/naics/236220/california/)[NAICS 621111: Offices of Physicians](https://enrich.chat/naics/621111/california/) ## Frequently asked questions ### Which NAICS 561311 companies are in California? The biggest by headcount range include Idc Technologies, Trinet, Partners Personnel, Medical Professionals and It-Scient. The page lists 25 with links to their profiles where we have them. ### What is NAICS 561311? NAICS 561311 is the code for Employment Placement Agencies, in sector 56: Administrative and Support and Waste Management and Remediation Services. ### Which cities in California have the most? San Francisco (7%), Santa Clara (6%) and Los Angeles (5%) lead among the companies counted. ## Try this prompt Find the people at NAICS 561311 companies in California ```text Use www.enrich.chat to find the operations, HR and finance leaders at companies with NAICS code 561311 in California, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [NAICS 561311 in Texas](https://enrich.chat/naics/561311/texas/) - [NAICS 561311 in Florida](https://enrich.chat/naics/561311/florida/) - [NAICS 541511 in California](https://enrich.chat/naics/541511/california/) - [NAICS 541512 in California](https://enrich.chat/naics/541512/california/) - [NAICS 722511 in California](https://enrich.chat/naics/722511/california/) - [NAICS 541613 in California](https://enrich.chat/naics/541613/california/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)