8-K

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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                                    FORM 8-K

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

                           Date of Report: May 3, 2004

                                ACNB CORPORATION
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            (Exact name of registrant's as specified in its charter)

         PENNSYLVANIA                 0-11783                     23-2233457
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(State or other jurisdiction     (Commission File #)         (I.R.S. Employer
 of incorporation)                                           Identification No.)

16 LINCOLN SQUARE, GETTYSBURG, PA                    17325
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(Address of principal executive offices)          (Zip Code)


                                 (717) 334-3161
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              (Registrant's telephone number, including area code)

Item 9.  Regulation FD Disclosure

         On May 3, 2004, ACNB Corporation, holding company for Adams County
National Bank, issued a press release announcing its financial results for the
first quarter ended March 31, 2004. A copy of the press release is attached
hereto as Exhibit 99.1.


Item 12.  Results of Operations and Financial Condition

         Pursuant to interim guidance issued by the Securities and Exchange
Commission relating to Item 12 filing requirements, the Corporation has
furnished the information required by Item 12 under Item 9 herein.
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                                   SIGNATURES

         Pursuant to the requirements of the Securities and Exchange Act of
1934, the Registrant has duly caused this report to be signed on its behalf by
the undersigned hereunto duly authorized.

                                                     ACNB Corporation



                                                     By:  /s/ Thomas A. Ritter
                                                          Thomas A. Ritter
                                                          President/CEO


Dated:  May 3, 2004






                                  EXHIBIT INDEX

Exhibit Number    Description


99.1                       Earnings Press Release for the quarter ended
                           March 31, 2004

EX-99.1

                                  EXHIBIT 99.1

[ACNB LOGO]


                                                                   Press Release
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FOR IMMEDIATE RELEASE
                                                         Contact: Lynda L. Glass
                                                                   (717)338-2257


                                ACNB CORPORATION
                         REPORTS FIRST QUARTER EARNINGS


GETTYSBURG, Pa., May 3---ACNB Corporation reported net income of $2,121,000 for
the first quarter of 2004, a decrease of $346,000, or 14%, compared to
$2,467,000 over the same period of 2003. Net income on a per share basis
amounted to $.39 for the first three months of 2004 and was $.45 a year ago. The
decrease in net income for first quarter 2004, as compared to first quarter
2003, can be attributed to balance sheet adjustments in anticipation of rising
interest rates later in 2004, expense increases related to employee benefits,
and additional expenses for professional services related to compliance with
corporate governance legislation.

     Dividends paid to shareholders for the first quarter of 2004 totaled
$1,142,000, or $.21 per share. This cash dividend of $.21 per share was paid on
March 15, 2004, to shareholders of record on March 1, 2004.



     Total assets of ACNB Corporation on March 31, 2004, were $866 million a
9% increase in comparison to March 31, 2003. Deposits rose by 8% over the
previous year to $653 million. Total loans increased by 10% to $419 million. A
2% rise in equity capital resulted in an aggregate of $73.2 million on March 31,
2004.

     ACNB Corporation is the financial holding company for Adams County National
Bank, Gettysburg, PA. Originally founded in 1857, Adams County National Bank
serves its marketplace via a network of fifteen retail banking offices located
throughout Adams County, PA, and in Dillsburg and Hanover, York County, PA.
Farmers National Bank of Newville, a division of Adams County National Bank,
operates three retail banking offices in the Newville, Cumberland County, PA,
area.
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ACNB #2004-08
May 3, 2004