--- title: "Marketing Agencies in Ohio: 1,051 Listed (2026)" description: "Ken's database lists 1,051 marketing agencies headquartered in Ohio (Oct 17, 2026). See the size breakdown, the largest firms and the filter." path: /data/marketing-agencies-in-ohio family: data updated: 2026-10-17 data_as_of: 2026-10-17 html: /data/marketing-agencies-in-ohio sources: - "https://app.ken.so" - "/pricing" facts: company_count: "1,051" state: "Ohio" industry_filter: "\"Advertising Services\" and \"Marketing Services\"" largest_size_band: "1-10 employees (79%)" data_as_of: "Oct 17, 2026" source: "Ken Search, POST /v1/search/companies" --- # Marketing Agencies in Ohio Ken's database lists 1,051 marketing agencies headquartered in Ohio as of Oct 17, 2026. The largest group, 79%, has 1-10 employees. ## Ken Search Results ### Ken Search Query: Industry: "Advertising Services" and "Marketing Services"; HQ state: Ohio; HQ country: United States; Employees on record: 1 or more | Field | Value | | --- | --- | | Companies | 1,051 | | 1-10 employees | 832 (79%) | | 11-50 employees | 181 (17%) | | 51-200 employees | 16 (2%) | 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 Marketing Agencies Are in Ohio? **In short:** 1,051 marketing agencies in Ken's database have their headquarters in Ohio (Oct 17, 2026). Ken's database lists 1,051 marketing agencies with headquarters in Ohio. The largest group, 79%, has 1-10 employees. A company with only a branch office in Ohio is not counted. **Marketing Agencies in Ohio by employee range, Oct 17, 2026** | Employees | Companies | Share | | --- | --- | --- | | 1-10 | 832 | 79% | | 11-50 | 181 | 17% | | 51-200 | 16 | 2% | | 201-500 | 1 | <1% | | 1,001-5,000 | 1 | <1% | | 10,001+ | 1 | <1% | | Not listed | 19 | 2% | | Total | 1,051 | 100% | Employee range as listed on each company profile, for the companies in the count. Not listed means the profile shows no size. ## Largest Marketing Agencies in Ohio **In short:** By employee count in Ken's database, the largest is Proforma in Independence with 1,001-5,000 employees. **Largest marketing agencies headquartered in Ohio by employee count, Oct 17, 2026** | Company | City | Employees | | --- | --- | --- | | Proforma | Independence | 1,001-5,000 | | Organic | Cincinnati | 501-1,000 | | OuterBox | Akron | 201-500 | | PRN, a STRATACACHE company | Dayton | 201-500 | | Custom Sign Center | Columbus | 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 marketing agencies in Ken's database with headquarters in Ohio on Oct 17, 2026. - Filter: Companies in Advertising Services or Marketing Services, with headquarters in Ohio, United States, and at least one employee on record. - Headquarters only. Companies with just an office in Ohio 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":["Advertising Services","Marketing Services"],"countries":["US"],"states":["Ohio"],"employeesCount":{"min":1},"pageSize":0} ``` ## FAQ ### How many marketing agencies are in Ohio? Ken's database lists 1,051 marketing agencies headquartered in Ohio as of Oct 17, 2026. ### Which marketing agencies in Ohio have the most employees? In Ken's database, Proforma, Organic and OuterBox have the most employees of the marketing agencies headquartered in Ohio. ### Can I get a list of marketing agencies in Ohio? 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 1,051 companies, narrow them by size or city, and find a valid email for the people you want to reach. 1. Set these filters: Industry: "Advertising Services" and "Marketing Services"; HQ state: Ohio; 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) - [Marketing Agencies in New York](/data/marketing-agencies-in-new-york) - [Marketing Agencies in Utah](/data/marketing-agencies-in-utah) - [Marketing Agencies in New Jersey](/data/marketing-agencies-in-new-jersey) - [Marketing Agencies in Connecticut](/data/marketing-agencies-in-connecticut) - [Marketing Agencies in Florida](/data/marketing-agencies-in-florida) - [Trucking Companies in Ohio](/data/trucking-companies-in-ohio) - [Construction Companies in Ohio](/data/construction-companies-in-ohio) - [Manufacturing Companies in Ohio](/data/manufacturing-companies-in-ohio) ## 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.