--- title: "Oil and Gas Companies in California: 1,142 Listed (2026)" description: "Ken's database lists 1,142 oil and gas companies headquartered in California (Oct 17, 2026). See the size breakdown, the largest firms and the filter." path: /data/oil-and-gas-companies-in-california family: data updated: 2026-10-17 data_as_of: 2026-10-17 html: /data/oil-and-gas-companies-in-california sources: - "https://app.ken.so" - "/pricing" facts: company_count: "1,142" state: "California" industry_filter: "\"Oil and Gas\"" largest_size_band: "1-10 employees (67%)" data_as_of: "Oct 17, 2026" source: "Ken Search, POST /v1/search/companies" --- # Oil and Gas Companies in California Ken's database lists 1,142 oil and gas companies headquartered in California as of Oct 17, 2026. The largest group, 67%, has 1-10 employees. ## Ken Search Results ### Ken Search Query: Industry: "Oil and Gas"; HQ state: California; HQ country: United States; Employees on record: 1 or more | Field | Value | | --- | --- | | Companies | 1,142 | | 1-10 employees | 761 (67%) | | 11-50 employees | 300 (26%) | | 51-200 employees | 43 (4%) | Ken's database, Oct 17, 2026. Headquarters counts, refreshed weekly. Action: [Search these companies free in Ken](/waitlist) (cost: Free to search, 1 credit ($0.02) per valid email) ## How Many Oil and Gas Companies Are in California? **In short:** 1,142 oil and gas companies in Ken's database have their headquarters in California (Oct 17, 2026). Ken's database lists 1,142 oil and gas companies with headquarters in California. The largest group, 67%, has 1-10 employees. A company with only a branch office in California is not counted. **Oil and Gas Companies in California by employee range, Oct 17, 2026** | Employees | Companies | Share | | --- | --- | --- | | 1-10 | 761 | 67% | | 11-50 | 300 | 26% | | 51-200 | 43 | 4% | | 201-500 | 7 | 1% | | 501-1,000 | 4 | <1% | | 1,001-5,000 | 4 | <1% | | 10,001+ | 1 | <1% | | Not listed | 22 | 2% | | Total | 1,142 | 100% | Employee range as listed on each company profile, for the companies in the count. Not listed means the profile shows no size. ## Largest Oil and Gas Companies in California **In short:** By employee count in Ken's database, the largest is Solar Turbines in San Diego with 5,001-10,000 employees. **Largest oil and gas companies headquartered in California by employee count, Oct 17, 2026** | Company | City | Employees | | --- | --- | --- | | Solar Turbines | San Diego | 5,001-10,000 | | California Resources Corporation | Los Angeles | 1,001-5,000 | | Clean Energy | Newport Beach | 501-1,000 | | Sempra Infrastructure | San Diego | 501-1,000 | | Nikkiso Clean Energy & Industrial Gases | Temecula | 501-1,000 | | Aera Energy LLC | Bakersfield | 501-1,000 | | SC Fuels | Orange | 201-500 | | Berry Corporation | Bakersfield | 201-500 | | Continental Alloys & Services | Los Angeles | 51-200 | | Royale Energy, Inc. | San Diego | 51-200 | Company-level data from Ken's database, ranked by employee count. This table reads each company's state from its address, so it can include large companies the count above misses because their record stores the state with a ZIP code. Public bodies, schools, job boards and companies with 50 employees or fewer are left out. ## How We Counted **In short:** We counted oil and gas companies in Ken's database with headquarters in California on Oct 17, 2026. - Filter: Companies in Oil and Gas (including oil extraction, natural gas extraction and refining), with headquarters in California, United States, and at least one employee on record. - Headquarters only. Companies with just an office in California are not counted. - These are companies in Ken's database (250M people and 24M companies), not every company that exists. - Some records store the state with a ZIP code, and the state filter misses those, so read the count as a floor. The largest-companies table reads the state from each record's address, so it includes them. - Counts as of Oct 17, 2026. We check them weekly, and the dates move only when a count or a listed company changes. - Pages publish only at 50 companies or more. Ken is our product, and these counts come from its company database. The request body for POST /v1/search/companies ```json {"industries":["Oil and Gas"],"countries":["US"],"states":["California"],"employeesCount":{"min":1},"pageSize":0} ``` ## FAQ ### How many oil and gas companies are in California? Ken's database lists 1,142 oil and gas companies headquartered in California as of Oct 17, 2026. ### Which oil and gas companies in California have the most employees? In Ken's database, Solar Turbines, California Resources Corporation and Clean Energy have the most employees of the oil and gas companies headquartered in California. ### Can I get a list of oil and gas companies in California? Yes. Run the filter on this page in Ken Search. Searching is free, and a valid email costs 1 credit ($0.02). ### How often is this count updated? We check it weekly. The dates on this page move only when a count or a listed company changes, so an older date means nothing moved since. ### Why does this count differ from other sources? Sources count differently: headquarters or any office, industry labels or government codes, and how many companies they track. This page counts headquarters in Ken's database with the filter shown above. ## Do this in Ken ### Search these companies in Ken Open Ken Search with the same filter to see all 1,142 companies, narrow them by size or city, and find a valid email for the people you want to reach. 1. Set these filters: Industry: "Oil and Gas"; HQ state: California; HQ country: United States; Employees on record: 1 or more. 2. Narrow by employee range or city. 3. Find valid emails and add the companies to a campaign. - Link: [Search these companies in Ken](/waitlist) - API: `POST /v1/search/companies` - MCP tool: `search_search_companies` - Cost: Free to search, 1 credit ($0.02) per valid email ## Related - [B2B company counts by industry and state](/data) - [Oil and Gas Companies in Texas](/data/oil-and-gas-companies-in-texas) - [Oil and Gas Companies in Oklahoma](/data/oil-and-gas-companies-in-oklahoma) - [Oil and Gas Companies in North Dakota](/data/oil-and-gas-companies-in-north-dakota) - [Oil and Gas Companies in Alaska](/data/oil-and-gas-companies-in-alaska) - [Oil and Gas Companies in Colorado](/data/oil-and-gas-companies-in-colorado) - [Construction Companies in California](/data/construction-companies-in-california) - [Trucking Companies in California](/data/trucking-companies-in-california) - [Manufacturing Companies in California](/data/manufacturing-companies-in-california) - [Pharmaceutical Companies in California](/data/pharmaceutical-companies-in-california) ## Sources | Source | URL | Checked | | --- | --- | --- | | Ken's company database, queried through Ken Search (POST /v1/search/companies) | https://app.ken.so | 2026-10-17 | | Ken pricing (credit cost per valid email) | /pricing | 2026-10-17 | ## Changelog - 2026-10-17: Page published with counts from Ken's database.