Exhibit 99.1

April 20, 2016

Press Release

FARMERS NATIONAL BANC CORP. ANNOUNCES

2016 FIRST QUARTER FINANCIAL RESULTS

CANFIELD, Ohio (April 20, 2016) – Farmers National Banc Corp. (Farmers) (NASDAQ: FMNB) today reported financial results for the three months ended March 31, 2016.

Net income for the three months ended March 31, 2016 was $4.8 million, or $0.18 per diluted share, which compares to $2.2 million, or $0.12 per diluted share, for the three months ended March 31, 2015. In comparing the first quarter’s results to the most recent previous quarter, net income of $4.8 million increased 51% compared to $3.2 million for the quarter ended December 31, 2015.

Annualized return on average assets and return on average equity were 1.03% and 9.41%, respectively, for the three month period ending March 31, 2016.

During 2015, Farmers completed the mergers of National Bancshares Corporation (NBOH) the holding company for the First National Bank of Orrville, and Tri-State 1^st Banc Inc. (Tri-State), the holding company for 1st National Community Bank of East Liverpool. These transactions resulted in the addition of $676 million in assets and 17 full-service branches in Northeastern Ohio and 1 in Beaver County in Pennsylvania.

Kevin J. Helmick, President and CEO, stated, “We are pleased to report that our earnings have increased through the successful integration of both mergers. We also continue to be encouraged by our organic loan growth, which has increased 22% during the past twelve months, and improvements in our level of noninterest income.”

2016 First Quarter Financial Highlights

Total loans were $1.32 billion at March 31, 2016, compared to $673.8 million at March 31, 2015. Loans grew 22% organically during the past twelve months, which is in addition to the $430 million and $66 million increase in loans resulting from the NBOH and Tri-State acquisitions, respectively. The organic increase in loans is a direct result of Farmers’ focus on loan growth utilizing a talented lending and credit team, while adhering to a sound underwriting discipline. Most of the increase in loans has occurred in the commercial real estate, commercial and industrial and residential real estate loan portfolios. Loans now comprise 75.3% of the Bank’s first quarter average earning assets in 2016, an improvement compared to 62.5% in 2015. This improvement along with the growth in earning assets organically and through merger activity has resulted in a 97% increase in tax equated loan income from the first quarter of 2015 to the same quarter in 2016.

Non-performing assets to total assets remain at a safe level, currently at 0.55%. Early stage delinquencies also continue to remain at low levels, at $10.1 million, or 0.74% of total loans, at March 31, 2016. Net charge-offs for the current quarter were $368 thousand, up slightly compared to $296 thousand in the previous quarter. It is important to note that annualized net charge-offs as a percentage of average net loans outstanding decreased from 0.22% for the 3 months ended March 31, 2015 to 0.11% for

0.11% the same period in 2016. Lending to the energy sector is insignificant and less than 1% of the loan portfolio.

The net interest margin for the three months ended March 31, 2016 was 4.07%, a 43 basis points increase from the quarter ended March 31, 2015. In comparing the first quarter of 2016 to the same period in 2015, asset yields increased 29 basis points, while the cost of interest-bearing liabilities decreased 20 basis points. Another key contributor to the increase in net interest margin was the shift in the mix of earning assets from securities to loans as explained previously. The increased margin is also partially due to the additional accretion as a result of the discounted loan portfolios acquired in the NBOH and Tri-State mergers. Excluding the amortization of premium on time deposits and FHLB advances along with the accretion of the acquired loan discount, the net interest margin would have been 9 basis points lower or 3.98% for the quarter ended March 31, 2016.

Noninterest income increased 22.5% to $4.9 million for the quarter ended March 31, 2016 compared to $4.0 million in 2015. Deposit account income increased $332 thousand, or 55%, in the current year’s quarter compared to the same quarter in 2015 and gains on the sale of mortgage loans increased $279 thousand, or 227%, in comparing the same two quarters. Debit card interchange fees also increased $314 thousand or 101% in comparing the first quarter of 2015 to the same quarter in 2016.

Farmers has remained committed to managing the level of noninterest expenses. Total noninterest expenses for the first quarter of 2016 were $14.4 million. Excluding expenses related to acquisition activities of $289 thousand, noninterest expenses were $14.2 million. Excluding expenses related to acquisition activities, annualized noninterest expenses measured as a percentage of quarterly average assets decreased from 3.34% in the first quarter of 2015 to 3.01% in the first quarter of 2016. Annualized salaries and employee benefits as a percent of average assets also decreased from 1.95% to 1.61% in comparing the first quarter of 2015 and 2016.

The efficiency ratio for the quarter ended March 31, 2016 improved to 62.7% compared to 70.7% for the same quarter in 2015. The main factors leading to the improvement in the efficiency ratio was the increase in net interest income and noninterest income, along with the stabilized level of noninterest expenses relative to average assets as explained in the preceding paragraphs.

2016 Outlook

Mr. Helmick added, “We are encouraged by the promising start to 2016 in our financial results. We will continue to focus our energy on the seamless integration of the newly acquired banks and customers. We remain committed to the businesses and families we serve and to our community banking approach and culture.”

Founded in 1887, Farmers National Banc Corp. is a diversified financial services company headquartered in Canfield, Ohio, with $1.9 billion in banking assets and $1 billion in trust assets. Farmers National Banc Corp.’s wholly-owned subsidiaries are comprised of The Farmers National Bank of Canfield, a full-service national bank engaged in commercial and retail banking with 38 banking locations in Mahoning, Trumbull, Columbiana, Stark, Wayne, Medina and Cuyahoga Counties in Ohio and Beaver County in Pennsylvania, Farmers Trust Company, which operates three trust offices and offers services in the same geographic markets and National Associates, Inc. Farmers National Insurance, LLC, a wholly-owned subsidiary of The Farmers National Bank of Canfield, offers a variety of insurance products.

Non-GAAP Disclosure

This press release includes disclosures of Farmers’ tangible common equity ratio and pre-tax, pre-provision income, which are financial measures not prepared in accordance with generally accepted accounting principles in the United States (GAAP). A non-GAAP financial measure is a numerical measure of historical or future financial performance, financial position or cash flows that excludes or includes amounts that are required to be disclosed by GAAP. Farmers believes that these non-GAAP financial measures provide both management and investors a more complete understanding of the underlying operational results and trends and Farmers’ marketplace performance. The presentation of this additional information is not meant to be considered in isolation or as a substitute for the numbers prepared in accordance with GAAP. The reconciliations of non-GAAP financial measures are included in the tables following Consolidated Financial Highlights below.

Forward-Looking Statements

This earnings release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, including statements about Farmers’ financial condition, results of operations, asset quality trends and profitability.

Forward-looking statements are not historical facts but instead represent only management’s current expectations and forecasts regarding future events, many of which, by their nature, are inherently uncertain and outside of Farmers’ control. Forward-looking statements are preceded by terms such as “expects,” “believes,” “anticipates,” “intends” and similar expressions, as well as any statements related to future expectations of performance or conditional verbs, such as “will,” “would,” “should,” “could” or “may.” Farmers’ actual results and financial condition may differ, possibly materially, from the anticipated results and financial condition indicated in these forward-looking statements. Factors that could cause Farmers’ actual results to differ materially from those described in the forward-looking statements can be found in Farmers’ Annual Report on Form 10-K for the year ended December 31, 2015, as amended, which has been filed with the Securities and Exchange Commission (SEC) and is available on Farmers’ website (www.farmersbankgroup.com) and on the SEC’s website (www.sec.gov). Forward-looking statements are not guarantees of future performance and should not be relied upon as representing management’s views as of any subsequent date. Farmers does not undertake any obligation to update the forward-looking statements to reflect the impact of circumstances or events that may arise after the date of the forward-looking statements.

Farmers National Banc Corp. and Subsidiaries

Consolidated Financial Highlights

(Amounts in thousands, except per share results) Unaudited

Average Balance Sheets and Related Yields and Rates

(Dollar Amounts in Thousands)