Company lists · Data verified August 2026

Top 25 Advertising agencies based in Ireland

Name: Advertising agencies based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 290 companies tracked

There are 290 advertising agencies headquartered in Ireland (RevenueBase, August 2026). RevenueBase tracks 3,323 professional contacts across them, including 1,387 with verified work emails and 265 with mobile numbers. Dublin is the largest hub.

This list covers advertising agencies headquartered in Ireland, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

290Companies

3,323Contacts tracked

1,387Verified emails

265Mobile numbers

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The 25 largest advertising agencies based in Ireland

Ranked by team size

Top 25 of 290 advertising agencies based in Ireland, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	The Delta Group	Swords	501-1,000	406	230
2	CORE	Dublin	201-500	283	179
3	Connelly Partners	Ballsbridge	51-200	141	80
4	Droga5 Dublin	n/a	51-200	94	49
5	Oliver Ireland	Glasnevin	51-200	66	51
6	CMS Marketing	Dublin	11-50	58	17
7	The Tenth MAN	n/a	51-200	57	39
8	Javelin Dublin	Smithfield	11-50	51	43
9	Zenith, Part Of Core	n/a	11-50	51	37
10	Starcom, Part Of Core	n/a	11-50	45	27
11	Spark Foundry, Part Of Core	n/a	11-50	39	23
12	Dynamo	n/a	11-50	37	26
13	Legacy Communications	Dublin	11-50	36	28
14	The Public House	Dublin	11-50	36	20
15	Journey	Bray	11-50	34	9
16	Mindshare Ireland	n/a	51-200	29	21
17	Bbdo Dublin	Sandymount	51-200	29	4
18	Universal Media	Dublin	11-50	29	1
19	Buymedia	Dublin	11-50	28	15
20	Goosebump LTD	n/a	11-50	25	17
21	Insight Marketing & Brand Services	Rathgar	11-50	25	7
22	Hopkins Communications	n/a	11-50	24	10
23	Southern Marketing Design Media	Little Island	11-50	24	4
24	Talon Ireland	Ballsbridge	201-500	23	21
25	Originate Creative	n/a	11-50	21	18

Showing 25 of 290 advertising agencies based in Ireland

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,387 reachable decision-makers.

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Advertising agencies based in Ireland at a glance

As of Aug 28, 2026

1-10Median size (employees)

DublinLargest hub · 94 HQs

265Contacts with mobile numbers

6Emails re-verified in last 30 days

Companies by employee count

1-10

185

11-50

51-200

201-500

501-1,000

5,001-10,000

Advertising agencies by metro

Metro	Companies
Advertising agencies in Dublin	94
Advertising agencies in Cork	11
Advertising agencies in Galway	7
Advertising agencies in Dublin City	7
Advertising agencies in Ireland	5
Advertising agencies in Kilkenny	4
Advertising agencies in Harolds Cross	3

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “advertising agencies”, with match quality audited by blind human judging, and headquartered in Ireland.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Contact records re-verify on a rolling cadence; 6 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many advertising agencies are there based in Ireland?

There are 290 advertising agencies headquartered in Ireland as of August 2026 (RevenueBase).

What is the largest company on this list?

The Delta Group, headquartered in Swords, tops this list with the largest team on record.

Which city has the most advertising agencies?

Dublin leads with 94 headquartered companies, followed by Cork (11) and Galway (7).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,387 verified decision-maker contacts tracked across these 290 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph, the same data that powers RevenueBase's B2B data products and the free research portal.