Exhibit 99.1

Press Release – For Immediate Release

July 19, 2013

Penns Woods Bancorp, Inc. Reports Second Quarter 2013 Operating Earnings

Williamsport, PA – July 19, 2013 - Penns Woods Bancorp, Inc. (NASDAQ:PWOD)

Penns Woods Bancorp, Inc. continued its strong earnings and growth during the recently completed second quarter of 2013. Earnings of $7,343,000 were achieved for the six month period ending June 30, 2013 resulting in basic and dilutive earnings per share of $1.84.

Highlights

“The results for the three and six months ended June 30, 2013 have been impacted by the completed acquisition of Luzerne National Bank Corporation into the Penns Woods Bancorp, Inc. family. The acquisition not only resulted in a significant increase in assets, loans, and deposits, but also more than doubled the population residing within the counties we are located. Access to the population base and businesses located within Luzerne and Lackawanna Counties will allow us to continue our strategic path of growing our balance sheet by acquiring high quality earning assets funded by core deposit growth. In addition to the completed acquisition, we continue to invest in revenue streams for the future including planned branches in Lewisburg and Loyalsock, the expansion of our residential secondary market footprint, and growth in our commercial services department,” said Richard A. Grafmyre, CFP®, President and CEO.

A reconciliation of the non-GAAP financial measures of operating earnings, operating return on assets, operating return on equity, and operating earnings per share, described in the highlights, to the comparable GAAP financial measures is included at the end of this press release.

Net Income

Net income, as reported under GAAP, for the three and six months ended June 30, 2013 was $3,659,000 and $7,343,000 compared to $3,398,000 and $7,087,000 for the same period of 2012. Results for the three and six months ended June 30, 2013 compared to 2012 were impacted by an increase in after-tax securities gains of $729,000 (from a gain of $112,000 to a gain of $841,000) for the three month periods and an increase in after-tax securities gains of $991,000 (from a gain of $501,000 to a gain of $1,492,000) for the six month periods. In addition, a gain of $109,000 on death benefit related to bank owned life insurance was recorded during the first quarter of 2012. Impacting the results for the three and six months ended June 30, 2013 was the recognition of $535,000 and $623,000 in expenses related to the acquisition of Luzerne National Bank Corporation. Basic and dilutive earnings per share for the three and six months ended June 30, 2013 was $0.88 and $1.84 compared to $0.89 and $1.85 for the corresponding periods of 2012. Return on average assets and return on average equity were 1.48% and 13.54% for the three months ended June 30, 2013 compared to 1.67% and 15.48% for the corresponding period of 2012. Return on average assets and return on average equity were 1.59% and 14.45% for the six months ended June 30, 2013 compared to 1.78% and 16.42% for the corresponding period of 2012.

Net Interest Margin

The net interest margin for the three and six months ended June 30, 2013 was 4.09% and 4.26% compared to 4.47% and 4.59% for the corresponding periods of 2012. While the net interest margin has decreased year over year, net interest income on a fully taxable equivalent basis has increased $927,000 and $1,369,000 for the three and six months ended June 30, 2013 compared to the corresponding period of 2012. Driving this increase is the growth in the loan and deposit portfolios for the six months ended June 30, 2013 compared to the corresponding period for 2012 primarily due to the acquisition of Luzerne National Bank Corporation, growth in home equity products, recognition of $528,000 in loan interest from the payoff of a nonaccrual loan in the first quarter of 2013, and the continued emphasis on core deposit growth. The primary funding for the loan growth was an increase in core deposits. These deposits represent a lower cost funding source than time deposits and comprise 75.03% of total deposits at June 30, 2013 compared to 72.89% at June 30, 2012. The continued growth in core deposits has led to the total cost of deposits decreasing to 54 bp for the six months ended June 30, 2013 from 75 bp for the corresponding period of 2012. FHLB long-term borrowings have been increased by $9,472,000 since June 30, 2012 to supplement the deposit funding of loan growth and FHLB debt that matured. Long-term borrowings of $5,528,000 matured during the six months ended June 30, 2013 carrying an average rate of 3.94%. The changes in the composition of the deposit and borrowing portfolios has led to the total cost of interest bearing funding decreasing to 77 bp for the six months ended June 30, 2013 from 109 bp at the corresponding period of 2012.

“As seen in the compression of the net interest margin, the margin has and will continue to encounter challenges as we move forward in the current rate environment. We continue to follow our strategic direction to add quality earning assets, even though these new earning assets are being added are at a lower rate than the legacy earning assets that are maturing or are repricing lower at their rate reset dates. Efforts are being undertaken to shorten the investment portfolio duration in order to reduce interest rate and market risk in the future. This is being undertaken primarily through purchases of variable rate and intermediate term corporate bonds. The earning asset strategies do limit current earnings, but they play a key role in our long-term asset liability management strategy. On the funding side of the balance sheet there is limited opportunity to reduce costs. Our focus will continue to be on lower cost core deposits, with an eye toward the lengthening of select funding sources as opportunities are presented,” commented President Grafmyre.

Assets

Total assets increased $388,525,000 to $1,206,958,000 at June 30, 2013 compared to June 30, 2012. Net loans increased to $777,557,000 at June 30, 2013 compared to June 30, 2012 due to the acquisition of Luzerne National Bank Corporation and campaigns related to increasing home equity product market share during 2012 and 2013. The investment portfolio increased $16,168,000 from June 30, 2012 to June 30, 2013 due primarily to the acquisition of Luzerne National Bank Corporation and the purchase of short maturity bonds that have been utilized to reduce the portfolio duration and to provide current cash flow. In addition, we continue to follow our strategy to reduce the investment portfolio duration through the selective selling of bonds as opportunities develop.

Non-performing Loans

Our non-performing loans to total loans ratio has decreased to 0.83% at June 30, 2013 from 1.87% at June 30, 2012. The decrease in non-performing loans is primarily the result of several partial charge-offs and the payoff of a large construction loan that was on nonaccrual. The majority of non-performing loans are centered on several loans that are either in a secured position and have sureties with a strong underlying financial position or have a specific allocation for any impairment recorded within the allowance for loan losses. Net loan recoveries of $712,000 for the six months ended June 30, 2013 augmented the allowance for loan losses which was 1.19% of total loans at June 30, 2013.

Deposits

Deposits have increased $314,194,000 to $955,361,000 at June 30, 2013 compared to June 30, 2012, with core deposits (total deposits excluding time deposits) increasing $249,484,000, while higher cost time deposits only increased $64,710,000. Noninterest-bearing deposits have increased $93,334,000 to $211,096,000 at June 30, 2013 compared to June 30, 2012. Driving this growth is our acquisition of Luzerne National Bank Corporation in addition to our commitment to easy-to-use products, community involvement, and emphasis on customer service. We have also successfully implemented a targeted marketing campaign aimed at further strengthening our customer relationships, while also expanding our market penetration.

Shareholders’ Equity

Shareholders’ equity increased $37,817,000 to $125,928,000 at June 30, 2013 compared to June 30, 2012. The accumulated other comprehensive loss of $4,521,000 at June 30, 2013 is a result of a decrease in unrealized gains on available for sale securities from an unrealized gain of $7,058,000 at June 30, 2012 to an unrealized gain of $286,000 at June 30, 2013. The amount of accumulated other comprehensive loss at June 30, 2013 was also impacted by the change in net excess of the projected benefit obligation over the market value of the plan assets of the defined benefit pension plan resulting in an increase in the net loss of $674,000 to $4,807,000 at June 30, 2013. The current level of shareholders’ equity equates to a book value per share of $26.14 at June 30, 2013 compared to $22.96 at June 30, 2012 and an equity to asset ratio of 10.43% at June 30, 2013 compared to 10.77% at June 30, 2012. Excluding goodwill and intangibles, book value per share was $22.17 at June 30, 2013 compared to $22.17 at June 30, 2012. Dividends declared for the three and six months ended June 30, 2013 were $0.47 and $1.19 per share, which includes a special cash dividend of $0.25 per share declared in the first quarter 2013, compared to $0.47 and $0.94 for the three and six months ended June 30, 2012.

Penns Woods Bancorp, Inc. is the parent company of Jersey Shore State Bank, which operates thirteen branch offices providing financial services in Lycoming, Clinton, Centre, and Montour Counties, and Luzerne Bank, which operates nine branch offices providing financial services in Luzerne and Lackawanna Counties. Investment and insurance products are offered through the bank’s subsidiary, The M Group, Inc. D/B/A The Comprehensive Financial Group.

NOTE: This press release contains financial information determined by methods other than in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”). Management uses the non-GAAP measure of net income from core operations in its analysis of the company’s performance. This measure, as used by the Company, adjusts net income determined in accordance with GAAP to exclude the effects of special items, including significant gains or losses that are unusual in nature such as net securities gains and losses. Because certain of these items and their impact on the Company’s performance are difficult to predict, management believes presentation of financial measures excluding the impact of such items provides useful supplemental information in evaluating the operating results of the Company’s core businesses. These disclosures should not be viewed as a substitute for net income determined in accordance with GAAP, nor are they necessarily comparable to non-GAAP performance measures that may be presented by other companies.

This press release may contain certain “forward-looking statements” including statements concerning plans, objectives, future events or performance and assumptions and other statements, which are statements other than statements of historical fact. The Company cautions readers that the following important factors, among others, may have affected and could in the future affect actual results and could cause actual results for subsequent periods to differ materially from those expressed in any forward-looking statement made by or on behalf of the Company herein: (i) the effect of changes in laws and regulations, including federal and state banking laws and regulations, and the associated costs of compliance with such laws and regulations either currently or in the future as applicable; (ii) the effect of changes in accounting policies and practices, as may be adopted by the regulatory agencies as well as by the Financial Accounting Standards Board, or of changes in the Company’s organization, compensation and benefit plans; (iii) the effect on the Company’s competitive position within its market area of the increasing consolidation within the banking and financial services industries, including the increased competition from larger regional and out-of-state banking organizations as well as non-bank providers of various financial services; (iv) the effect of changes in interest rates; and (v) the effect of changes in the business cycle and downturns in the local, regional or national economies. For a list of other factors which could affect the Company’s results, see the Company’s filings with the Securities and Exchange Commission, including “Item 1A. Risk Factors,” set forth in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012.

You should not place undue reliance on any forward-looking statements. These statements speak only as of the date of this press release, even if subsequently made available by the Company on its website or otherwise. The Company undertakes no obligation to update or revise these statements to reflect events or circumstances occurring after the date of this press release.

Previous press releases and additional information can be obtained from the Company’s website at www.jssb.com.

THIS INFORMATION IS SUBJECT TO YEAR-END AUDIT ADJUSTMENT

PENNS WOODS BANCORP, INC.

CONSOLIDATED BALANCE SHEET

(UNAUDITED)

PENNS WOODS BANCORP, INC.

CONSOLIDATED STATEMENT OF INCOME

(UNAUDITED)

PENNS WOODS BANCORP, INC.

AVERAGE BALANCES AND INTEREST RATES

PENNS WOODS BANCORP, INC.

AVERAGE BALANCES AND INTEREST RATES