It was a rare blowout for the AFC North-leading Ravens, who won their previous five games by a total of 23 points.
Asked how such a thing could happen, coach John Harbaugh replied, "I have no answer for that. Sometimes it just goes that way, right? Our guys made some plays."
Flacco and the resurgent Baltimore offense made it look easy against the struggling Raiders (3-6), who have yielded at least 40 points in two straight games for the first time since 1962. The 55 points tied an Oakland record for points allowed, set in 1961 and matched in 1981.
Baltimore led 27-10 at halftime. In the third quarter, Smith scored twice and holder Sam Koch scored on a fake field goal to make it 48-17.
In the fourth quarter, Jones scored on a kickoff return for the second time this season for a 55-20 lead. Baltimore's previous record for points in a game was 48, against Detroit in December 2009.
"Obviously, we had success," Flacco said, who also ran for a score. "We ran the game plan and it worked well. We stuck with it. We scored points early and continued to score them."
Baltimore has 15 straight home wins, the longest current streak in the NFL.
Carson Palmer went 29-for-45 for 368 yards and two touchdowns for Oakland. He was mercifully pulled in the fourth quarter.
"Rough, rough, rough, rough game," Palmer said. "We didn't play any good in any facet of the game. Came in and got outplayed by a good football team. It's very frustrating. We got to put this one in our rear view mirror, because it's going to be a tough one to get past."
Baltimore didn't punt until the third quarter, and even that turned out well. Phillip Adams fumbled, the Ravens recovered the ball and Flacco promptly threw a touchdown pass to Smith.
Later in the quarter, Koch ran 7 yards for a touchdown to cap a 74-yard drive.
Burned for 251 yards on the ground last week by Tampa Bay rookie Doug Martin in a 42-32 defeat, Oakland shored up its run defense to stop Ray Rice. So Flacco went to the air, repeatedly hitting tight ends Dennis Pitta and Ed Dickson over the middle in the first half before going long and outside to Smith in the third quarter.
Flacco went 21-for-33 and did not play in the fourth quarter.
Rice ran for 35 yards and a touchdown on 13 carries. He finished the afternoon with 5,034 yards rushing for his career, joining Jamal Lewis as the only players in Ravens history to top 5,000.
But that gave Flacco enough time to add another touchdown before the break. He went 5 for 6 for 73 yards before Rice ran for a 7-yard score.
After an Oakland punt, Flacco completed an 18-yard pass to Pitta and connected with Dickson for 40 yards before scoring on a 1-yard run to make it 10-0.
Flacco responded by covering 80 yards in six plays for a 17-3 lead. After completing a 47-yard pass to Jones and a 19-yarder to Dixon, Flacco tossed a 5-yard touchdown pass to Pitta.
NOTES: Oakland LB Travis Goethel left in the first quarter with a knee injury and did not return. Oakland CB Michael Huff was kicked in calf, and S Matt Giordano and TE Brandon Myers sustained concussions. ... Baltimore is 7-1 against Oakland (including playoffs) and 5-0 at home. ... Jones is the first Ravens player to have two KO returns for TDs.
Copyright 2012 by The Associated Press