Meanwhile, incumbents Ken Sanchez, Klarissa Peña, Diane Gibson and Don Harris fended off challengers to retain their City Council seats.
Aragon was the leading vote-getter in the far northwest district, with 39 percent of the vote, while Borrego received 38 percent in the three-way contest.
Aragon, 60, an Albuquerque attorney and a former state representative, was a registered Democrat until 2012, when he switched to the Republican Party.
Borrego, 59, a self-described conservative Democrat, was a planner for the city of Albuquerque and Bernalillo County for 28 years and is now retired.
Political newcomer Catherine Trujillo, 26, a 2014 graduate of the University of New Mexico, pulled in 23 percent of the vote, appearing to force a runoff election in District 5.
Candidates need to capture at least 50 percent of the vote to win an election outright and avoid a runoff.
A 52 percent majority of voters in City Council District 1 appeared to allow Sanchez, 61, to hang on to the seat he has held since 2005 in a race against three challengers.
Sanchez is a Democrat who operates an accounting firm and is president of Ken Sanchez & Associates Realty. The West Side District 1 is south of Montaño NW and north of Central.
Among his challengers, Johnny F. Luevano, an independent, received 18 percent of the vote; Javier Benavidez, a Democrat, received 19 percent; and independent Sandra Mills received 11 percent.
Peña, 51, a Democrat with a business and community service background, won a second term in the District 3 seat, with 68 percent of the vote. Her challenger, Christopher Sedillo, 54, a Democrat and U.S. Navy veteran, received 32 percent.
District 3 encompasses Southwest Albuquerque south of Central Avenue.
Gibson, 65, a Democrat and retired Sandia National Laboratories employee, also won a second term in District 7, with 67 percent of the vote.
Her challenger Eric L. Lucero, 59, a Republican who served in the U.S. Air Force, received 33 percent.
District 7 is a rectangular Northeast Heights district between Interstate 25 and Eubank NE, and between Montgomery and Lomas NE.
In the District 9 contest, Harris, 55, a three-term incumbent Republican and Albuquerque attorney, pulled in 57 percent of the vote against two challengers in the district south of Menaul and east of Eubank.
His opponents, Byron Powdrell, 50, a Democrat and general manager of a low-power radio station, received 26 percent, and Paul Ryan McKenney, 34, a Libertarian and stay-at-home dad, received 16 percent.
Nov. 14 runoff set for District 5 council race
Incumbents in Districts 1, 3, 7 and 9 fend off challengers to retain their seatsDistrict 5 City Council candidate Robert Aragon watches the election returns at home Tuesday. He is headed for a runoff in the far northwest district with Cynthia Borrego, right, who gets a high-five from a supporter.