SECURITIES AND EXCHANGE COMMISSION

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934

For the Fiscal Year Ended December 31, 2004

Commission File Number 0-21656

UNITED COMMUNITY BANKS, INC.

Registrant’s telephone number, including area code: (706) 781-2265

Securities registered pursuant to Section 12(b) of the Act: None

Name of exchange on which registered: None

Securities registered pursuant to Section 12(g) of the Act:
Common Stock, $1.00 par value

     Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No o

     Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. þ

     Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act). Yes þ No o

     Aggregate market value of the voting stock held by non-affiliates of the Registrant: $757,280,857 (based on shares held by non-affiliates at $25.18 per share, the closing stock price on the Nasdaq stock market on June 30, 2004).

     As of January 31, 2005, 38,551,078 shares of common stock were issued and outstanding, including 372,000 shares deemed outstanding pursuant to prime plus 1/4% convertible subordinated payable-in-kind debentures due December 31, 2006 and presently exercisable options to acquire 1,259,289 shares.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s Proxy Statement for the Annual Meeting of Shareholders to be held on April 27, 2005 are incorporated herein into Part III by reference.

Porter Keadle Moore, LLP

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors
United Community Banks, Inc.
Blairsville, Georgia

We have audited the consolidated balance sheets of United Community Banks, Inc. and subsidiaries as of December 31, 2004 and 2003, and the related consolidated statements of income, changes in stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2004. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provided a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of United Community Banks, Inc. and subsidiaries as of December 31, 2004 and 2003, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2004, in conformity with generally accepted accounting principles in the United States of America.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the effectiveness of United Community Banks, Inc. and subsidiaries’ internal control over financial reporting as of December 31, 2004, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) and our report dated February 16, 2005 expressed an unqualified opinion on management’s assessment of the effectiveness of United Community Banks, Inc.’s internal control over financial reporting and an unqualified opinion on the effectiveness of United Community Banks, Inc.’s internal control over financial reporting.

Atlanta, Georgia
February 16, 2005

Certified Public Accountants

SIGNATURES

     Pursuant to the requirements of Section 13 or 15(a) of the Securities Exchange Act of 1934, United has duly caused this Report on Form 10-K, as amended, to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Blairsville, State of Georgia, on the 17th of March, 2005.