THOMASVILLE, N.C.--( BUSINESS WIRE )-- Old Dominion Freight Line, Inc. ( NAS: ODFL ) today announced its financial results for the three- and twelve-month periods ended December 31, 2012. Revenue increased 8.7% to $527.3 million for the fourth quarter from $485.1 million for the fourth quarter of 2011. Net income for the fourth quarter of 2012 was $39.5 million, or $0.46 per diluted share, compared with $39.9 million, or $0.46 per diluted share, for the fourth quarter of 2011. Old Dominion's operating ratio was 87.2% for the fourth quarter of 2012 compared with 86.9% for the fourth quarter of 2011. All prior-period share and per share data in this release have been adjusted to reflect the Company's September 2012 three-for-two stock split.