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
What 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 MoreWhat Happens If You Divorce Before Your Green Card Interview?
Divorce is hard enough on its own, but it becomes even more complicated when immigration paperwork is still in progress. If you are waiting for a…
Read MoreUSCIS Freezes Humanitarian Parole: Is Your Case on Hold?
If you came to the U.S. under a humanitarian parole program, you may be wondering what’s happening with your case. Earlier this year, USCIS froze applications…
Read More¿Puede una Persona Deportada Regresar Legalmente?
¿Alguna vez te has preguntado si la deportación significa realmente que no puedes regresar jamás? Muchas personas asumen que, una vez que han sido expulsadas del…
Read MoreO-1 vs. H-1B: Choosing the Right Visa for Skilled Workers
Balancing two promising U.S. job offers can quickly reveal that the real hurdle is choosing the right visa. Every spring, countless talented professionals face this crossroads.…
Read MoreCommon Pitfalls When Selecting an Immigration Lawyer
Choosing the right immigration lawyer can feel like walking a tightrope. One small slip and your visa, green card, or citizenship plans may wobble. At N400…
Read MoreHow to Go From an E2 Visa to a U.S. Green Card
Running a business in the United States on an E2 visa feels exciting, yet the temporary label on that visa can weigh on your mind. You…
Read MoreSouthern Border Entry Suspended Under New Executive Order
On January 20, 2025, President Trump signed an executive order that stops most migrants—including asylum seekers—from entering through the southern border. The order calls the current…
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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