Your Partner in Overcoming Immigration Challenges
Helping Individuals, Businesses and Organizations Nationwide to obtain their Visas, Green Cards and Citizenship.
N400 Harbor Immigration Law
N400 Harbor Immigration Law, P.L.L.C. is a full-service immigration law firm located in Pompano Beach, Florida. In addition to serving clients in Florida, we help individuals, businesses, and organizations nationwide to obtain visas, Green Cards, and citizenship.

Comprehensive Immigration Services You Can Trust
At N400 Harbor Immigration Law we understand that the United States of America is a melting pot of immigrants from all over the world. We also are aware of the legal challenges that many immigrants who are coming and seeking to stay in the U.S. face every day. Here at N400 Harbor Immigration Law we work tirelessly and compassionately to help our clients navigate the complexities of the U.S. immigration legal system.
We are invested in your story and provide legal services with a high level of expertise and care. We would be honored to represent you, so you can plan and build your future in the United States of America.
Our Services
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Dario Castañeda, ESQ
Founder & Managing Attorney
Mr. Castañeda concentrates his practice in both family-based and employment immigration law and has extensive experience in removal proceedings.
Immigration News
Qué Significa para Usted la Nueva Política de Inmigración “America First”
El enfoque de “America First” en inmigración se centra en una aplicación más estricta, menos beneficios y mayor prioridad para los ciudadanos nacidos en el país.…
Read MoreK1 Visa Interview Questions: What to Expect
Applying for a K-1 fiancé(e) visa is an emotional process — not just because it’s a major step toward starting your life together in the United…
Read MoreWhat Are the Advantages of a Green Card?
Dreaming of building a life and career inside the United States is common across the globe. Securing a Green Card often turns that dream into daily…
Read MoreWhat the New ‘America First’ Immigration Policy Means for You
The “America First” approach to immigration focuses on stronger enforcement, fewer benefits, and greater priority for native-born citizens. Many people are now facing uncertainty about their…
Read MoreLo Que Significa Para Usted la Nueva Política de Inmigración “America First”
El enfoque de “America First” en inmigración se centra en una aplicación más estricta, menos beneficios y mayor prioridad para los ciudadanos nacidos en el país.…
Read MoreLooking to Invest in the U.S.? List of E2 Visa Treaty Countries and Eligibility
Small and mid-size investors around the world dream of opening shops in the United States, yet many assume only million-dollar budgets qualify. The E2 visa proves…
Read MoreK1 Visa Denied: Common Reasons and What to Do Next
Few moments sting quite like hearing that a fiancé(e) visa has been refused after months of planning. You and your partner likely pictured a smooth countdown…
Read MoreWhat Documents Are Required to Renew a Green Card?
That small plastic card in your wallet does more than prove your identity. It confirms your right to live and work permanently in the United States.…
Read MoreIs an Immigration Lawyer Necessary to Get a Green Card?
Applying for U.S. permanent residence might seem simple at first glance, but one missed signature or incorrect date can set your case back by months. Friends…
Read MoreI-140 Denied? Here’s What Might Have Gone Wrong
Waiting on an I-140 decision often feels like watching a pot that refuses to boil. When a denial notice finally arrives, the disappointment can hit hard.…
Read MoreStories from Our Satisfied Clients
"I had an exceptional experience with Dario Castaneda during a recent phone consultation. He was incredibly knowledgeable and took the time to thoroughly explain every detail of my case, ensuring I fully understood my options. His professionalism and patience were evident throughout the entire conversation, and I never felt rushed. Dario's expertise in immigration law is clear, and his ability to break down complex legal matters into easy-to-understand terms made me feel confident and well-informed. I highly recommend him for anyone in need of immigration legal assistance!"
"Amazing lawyer! Dario guided us through the entire process of requesting our E2 Visa. He was always available for my calls or texts, also his team was always on top of every single detail. He got us ready for our interview and presented a great case, we only got asked two questions during the interview because of this!"
"I recently attained U.S. citizenship, and I owe my gratitude to Dario Castenada and N400 Harbor Immigration Law for their invaluable assistance. Dario expertly guided me through every step of the process. He even took the time to call me the day before my interview, outlining what I should expect and the kinds of questions that would be asked. I'm extremely thankful for Dario's effort to alleviate my stress!"
"Do yourself a favor and hire Attorney Dario and his team. They are amazing, they made my immigration application process easy and so smooth. I was able to get everything I needed in exactly a year. I am now a green card holder and ready to travel the world. Thank you Dario for everything.”
"Dario and the N400 Harbor Immigration Law team are extremely knowledgeable, and they take the time to patiently explain the complexities of immigration law. He is a very empathetic person who goes above and beyond to ensure everything is done with a keen eye for detail and in a timely manner. Dario is quick to respond to any inquiries and ensures you feel listened to and understood"
"I just want to start off by saying how thankful and blessed I was for coming across Dario and his whole attorney team. Dario helped my husband with receiving his citizenship a few weeks back, it was stressful for us due to my husband having a background many years back but Dario fought for us and helped push everything thru and made it as stress free as possible. He was always so understanding and explained everything so thoroughly. I would highly recommend him!"
"Mr. Castaneda has shown a lot of attention to my citizenship process and is very attentive throughout each step. He is very knowledgeable in his field and I am very glad that I have him representing me. I am very confident in his skills and it's a great comfort knowing that I hired a top-tier professional like Dario, to guide me through this complicated process!"
"Dario and everyone at his firm did an incredible job with our case which had a positive outcome. He immediately put our mind at ease with excellent consultation. He filed the forms in an incredible timely and thorough manner. He followed up immediately when the government responded. And he coached us before our interview which made everything easier. I would recommend him to anyone who has an immigration issue."
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