Denver, CO
IRS Form 6166 Apostille in Denver, CO
How Denver residents get their IRS Form 6166 authenticated for use abroad — which office handles it, the local details, timing and price.
Quick answer
There’s no federal apostille office in Denver. Federal documents like your IRS Form 6166 are authenticated only by the U.S. Department of State in Washington, D.C. We handle that submission; you send the document by mail.
- County
- The City and County of Denver
- Federal court
- U.S. District Court for the District of Colorado
- State apostille office
- Colorado Secretary of State, Denver
- Our nearest office
- Denver
Why living in Colorado doesn’t change the route
This document is issued by Internal Revenue Service, a federal authority. Federal documents are authenticated only by the U.S. Department of State in Washington, D.C. — the Colorado Secretary of State in Denver has no authority over them, and a state apostille on a federal document will be rejected abroad.
So the process for Colorado residents is the same as for anyone else in the country: get the document to us, we hand-deliver it in Washington, and it comes back ready to use.
Denver: the local details
Denver is in the City and County of Denver, within the U.S. District Court for the District of Colorado. Colorado state documents are apostilled by the Colorado Secretary of State in Denver.
About the IRS Form 6166
How to apostille IRS Form 6166, the U.S. tax-residency certification used for tax-treaty benefits and accounts abroad.
Getting it done from Denver
Our Denver office handles Denver orders by phone and online. It’s a processing office and isn’t open to the public, so documents come to us by mail.
| Destination | Route | Our turnaround |
|---|---|---|
| Hague Convention country | U.S. Department of State apostille | 10–12 business days |
| Non-Hague country | Authentication + embassy legalization | 15–17 business days |
Official sources: IRS — Form 8802 & Form 6166 · U.S. Department of State — Authenticate Your Document · Colorado Secretary of State — Apostilles & Authentications · HCCH — Apostille Convention status table (Hague countries) · U.S. Courts — Federal Court Websites.
IRS Form 6166 in Denver — FAQ
Is there an apostille office in Denver for a IRS Form 6166?
No. The only office that can authenticate this document is the U.S. Department of State in Washington, D.C. We handle that submission for Denver clients by mail.
Do I need to visit an office in Denver?
No. Our Denver office isn’t open to the public — Denver clients order online or by phone, send documents by mail and receive them back by tracked courier.
How long does it take from Denver?
About 10–12 business days for Hague Convention countries and 15–17 for non-Hague countries including embassy legalization, plus shipping.
How much does it cost?
$299 per document for Hague countries, with government fees and U.S. shipping included; non-Hague destinations are $399 including embassy legalization.
Which federal court covers Denver?
Denver is in the City and County of Denver, within the U.S. District Court for the District of Colorado.
Related: All documents in Denver · IRS Form 6166 in Colorado · IRS Form 6166 — full guide
Ready to start?
Order online in minutes, or call and we will walk you through it. Federal documents from anywhere in the U.S. — one flat price, all government fees included.