The first public nonpartisan poll of the Philadelphia mayor’s race revealed just how tight the contest is to become the city’s 100th chief executive.

The nonprofit Committee of Seventy released its survey on Friday morning, showing the former city controller Rebecca Rhynhart has a one percentage-point edge over former city councilwoman Cherelle Parker and a three-point advantage over Helen Gym.

Rhynhart garnered 18 percent support from 1,500 Philadelphia adults surveyed, while Parker and Gym pulled in 17 and 15 percent, respectively.

Businessman Allan Domb was not far off the lead pace at 14 percent and ShopRite magnate Jeff Brown polled at 11 percent. Twenty percent of those contacted remain undecided with just over two weeks remaining.

The Committee of Seventy survey also asked respondents how they would rank their choices if given the option. “Ranked-choice voting” eliminates candidates one-at-a-time until one candidate wins with more than 50% of votes. If a voter’s first choice is eliminated, their ballot counts for their next highest ranked candidate. In the Committee of Seventy’s poll, Rhynhart came in first and Parker came in second when voters were given the option of ranking.

“These results make clear what we knew all along: that every vote matters,” said Lauren Cristella, Committee of Seventy’s interim president and chief operating officer. “We want every eligible voter to vote, to be informed when they vote, and to vote with confidence. This poll is a snapshot in time that hopefully gives voters an additional piece of information to use when they walk into a voting booth or complete a mail-in ballot. There are a lot of great tools available to help voters make the right decisions for themselves and their families, and we undertook this poll to add one more tool to the toolbox.”

This story will be updated