N-400 — Naturalization immigration law firms
About the N-400 category
Form N-400 is the application for naturalization — the process by which a lawful permanent resident becomes a U.S. citizen. Eligibility generally depends on holding a green card for the required number of years, meeting continuous-residence and physical-presence requirements, demonstrating good moral character, and passing English and U.S. civics tests, with some exceptions and accommodations available. USCIS conducts a biometrics appointment and an interview, and the case concludes with the oath of allegiance. Naturalization rewards careful preparation: long trips abroad, tax issues, an old arrest, or even an unnoticed problem in the original green-card case can surface at the interview, so a thorough eligibility review before filing is genuinely worthwhile.
Who the N-400 category is for
- You are a permanent resident meeting the residence and physical-presence rules.
- You show good moral character and pass the English and civics tests.
- Some applicants qualify for exceptions or accommodations.
How the process works
How a naturalization case unfolds: a lawful permanent resident confirms eligibility — the required years of residence, physical presence in the U.S., continuous residence, good moral character, and the English and civics requirements — and files Form N-400. USCIS schedules a biometrics appointment and then an interview, at which an officer reviews the application, tests English and civics, and examines the applicant's full immigration and personal history. If everything is in order, the case ends with the oath of allegiance. N-600 cases proceed by documentary review of the parent's citizenship and the applicant's qualifying relationship.
Common N-400 pitfalls
A handful of avoidable problems account for most setbacks in these cases — nearly all of them easier to fix before filing than after:
- Applying before the residence and presence math is met.
- Unresolved tax issues or undisclosed arrests.
- Long absences that break continuous residence.
Related citizenship options
Not sure the N-400 is the right fit? These related routes are worth comparing:
When a law firm helps most
A firm's depth is genuinely useful for N-400 cases: more hands for document-heavy filings, redundancy so a deadline is never missed, and experience spread across categories when a case has more than one moving part. For companies sponsoring workers, that capacity — and the compliance support that comes with it — is often the deciding factor between a firm and a solo practitioner.
What to look for in a firm
When you compare the firms above, weigh:
- Relevant caseload — a firm that files matters like yours regularly, not just occasionally.
- Team and capacity — enough attorneys and paralegals to meet deadlines without bottlenecks.
- A clear point of contact — someone named who owns your file and keeps you updated.
- Languages you speak — so nothing is lost between you and your case.
- Transparent pricing — flat or clearly explained fees, agreed before the work begins.
Solo attorney or law firm?
Solo attorney or law firm? A larger firm suits employers, investors and clients with complicated histories who need broad capacity and built-in redundancy; a solo immigration attorney can offer a more personal relationship and lower fees for a straightforward N-400 cases. Immigrantio lists both, so you can weigh team size, focus, languages and verified reviews side by side — and if you would rather work one-to-one, our immigration lawyers cover the same category.
Why use Immigrantio
Immigrantio exists to make that comparison straightforward. Every immigration law firms listed here is a verified, Bar-licensed U.S. immigration practice — never paid placement disguised as a recommendation. You can filter by language, location and price, read genuine client reviews, and see consultation fees up front, so you choose counsel for N-400 cases with real information instead of guesswork. There are no referral fees and no middlemen: you deal with the lawyer directly, from the first consultation onward.
Find a practice above that fits your situation, budget and language, then book a consultation to map out the path ahead step by step — and to get your most pressing questions answered by someone who handles these cases.