Company lists · Data refreshed September 2026
Top 25 Dual citizenship law firms worldwide
RevenueBase identified 1,474 dual citizenship law firms worldwide as of September 2026 and tracks 7,710 professional contacts across them, including 2,178 with verified work emails. The United States is the largest market and Madrid the largest hub.
This list covers dual citizenship law firms worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026. Country and city lists for dual citizenship law firms follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest dual citizenship law firms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 312 contacts → | ||||
Indirect evidence “A Cidadania4u é a maior empresa de especialistas em processos de reconhecimento de cidadania italiana, portuguesa e alemã do Brasil.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 2 | 201 contacts → | ||||
Indirect evidence “Somos uma empresa de assessoria que busca auxiliar na etapa documental os descendentes de portugueses e italianos a adquirirem a Dupla Cidadania.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 3 | 137 contacts → | ||||
Strong evidence “ICA provide assistance throughout the dual italian/US citizenship process to individuals and families” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 4 | 121 contacts → | ||||
Indirect evidence “Reach Immigration was established in the capital of Jordan, Amman, in Since its establishment, it has been one of the region’s market leaders in providing legal advice related to…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 5 | 93 contacts → | ||||
Indirect evidence “NOSSO COMPROMISSO É COM O SEU DIREITO DE SER O Gruppo Nostrali nasce para atender, orientar e assessorar os cidadãos italianos e portugueses e seus descendentes, com equipe…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 6 | 76 contacts → | ||||
Indirect evidence “Especialistas en Derecho migratorio y Derecho genealogista.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 7 | 68 contacts → | ||||
Partial evidence “BAYAT Legal Services is a boutique law firm established in the UAE in 1993 by Quebec-bar lawyer SAM BAYAT.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 8 | 63 contacts → | ||||
Indirect evidence “UK and US Immigration lawyers with offices in London and New York, regarded as a “stellar” boutique immigration firm with a powerful transatlantic capability.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 9 | 60 contacts → | ||||
Indirect evidence “Ace Luxury Immigration Solutions provides you with the most extensive Business Immigration ideas.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 10 | 58 contacts → | ||||
Partial evidence “In 1994, the late Attorney David Cohen (1946-2021) who was the Senior Partner at Cohen Immigration Law, launched canadavisa.com.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 11 | 54 contacts → | ||||
Indirect evidence “Despacho de abogados altamente especializado en Extranjería y Movilidad Internacional” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 12 | 48 contacts → | ||||
Partial evidence “Martins Castro - International Consultancy in Citizenship and Mobility for Europe Martins Castro has a team of experts in legal assistance for Portuguese and Spanish nationality…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 13 | 48 contacts → | ||||
Indirect evidence “A Simonato é uma assessoria especializada exclusivamente em cidadania italiana.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 14 | 47 contacts → | ||||
Partial evidence “Van Der Hout LLP has specialized in the practice of immigration and nationality law since the firm was founded by Marc Van Der Hout in 1980.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 15 | 44 contacts → | ||||
Partial evidence “Citizenship Invest is a pioneering advisory firm specializing in investors programs to obtain residency and citizenship in multiple countries worldwide and is accredited by…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 16 | 44 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 17 | 43 contacts → | ||||
Partial evidence “Founded in 1997, Garfinkel Immigration Law Firm is one of the largest immigration firms in the Carolinas.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 18 | 42 contacts → | ||||
Partial evidence “Reeves Immigration Law Group is known for extraordinary commitment to clients and is devoted exclusively to the practice of U.S.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 19 | 41 contacts → | ||||
Indirect evidence “A Terra Nostra Cidadania é uma assessoria com mais de 24 anos de experiência.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 20 | 41 contacts → | ||||
Indirect evidence “Trabajamos en procesos de Nacionalidades Portuguesa para clientes naturales, y al mismo tiempo resolvemos todas las dudas corporativas que puedan surgir a las empresas, tanto…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 21 | 39 contacts → | ||||
Partial evidence “WHO WE ARE Decker, Pex & Co is an Israeli law firm with extensive experience in immigration, working with both local and foreign clients.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 22 | 37 contacts → | ||||
Partial evidence “The Sapochnick Law Firm is a firm wholly dedicated to US and Global immigration law and the highest personal and ethical standard of client service.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 23 | 37 contacts → | ||||
Partial evidence “Everaert Advocaten is a leading immigration law firm in the Netherlands.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 24 | 37 contacts → | ||||
Indirect evidence “A Master Cidadania é um escritório especializado no reconhecimento da cidadania italiana pela via judicial.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 25 | 35 contacts → | ||||
Partial evidence “Wildes & Weinberg, P.C, perhaps the United States' premier law firm concentrating in the immigration and nationality field, grew out of the practice of Leon Wildes, Esq, a…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: dual citizenship law firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names dual citizenship law firms.
- Partial evidence
- Its own public description names part of dual citizenship law firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name dual citizenship law firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 1,474 dual citizenship law firms worldwide
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Dual citizenship law firms worldwide at a glance
As of Sep 28, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among dual citizenship law firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for dual citizenship law firms are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “dual citizenship law firms”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names dual citizenship law firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among dual citizenship law firms, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- 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
- Every listed company carries at least one verified work email, 2,178 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Dual citizenship law firms by location
11 lists · largest firstEvery Dual citizenship law firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Dual citizenship law firms based in the United States423
- Dual citizenship law firms based in Spain157
- Dual citizenship law firms based in Brazil127
- Dual citizenship law firms based in Canada78
- Dual citizenship law firms based in the United Kingdom55
- Dual citizenship law firms based in the United Arab Emirates50
- Dual citizenship law firms based in Portugal43
Cities
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names dual citizenship law firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many dual citizenship law firms are there worldwide?
RevenueBase identified 1,474 dual citizenship law firms worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Cidadania4u, headquartered in Aguas Claras, tops this list with the largest team on record.
Which country has the most dual citizenship law firms?
The United States leads with 423 companies, followed by Spain (157) and Brazil (127). Every dual citizenship law firms list by country and city is linked on this page.
Which city has the most dual citizenship law firms?
Madrid leads with 59 headquartered companies, followed by New York (49) and Sao Paulo (38).
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 2,178 verified decision-maker contacts tracked across these 1,474 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 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 with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.