The Glovers' nine-match winning run came to a surprise end with a 2-1 reverse at Oxford, giving Scunthorpe the opportunity to move top if they beat Bury by two goals or more.
But with a hard-fought 3-2 win over the Shakers at Glanford Park, both sides currently boast 52 points and a goal difference of +19. Yeovil keep the top position though having hit the back of the net more times.
Other results all went in United's favour, with third placed Swansea being held by Wycombe. Nathan Tyson flicked in a free-kick from Steve Guppy after 83 minutes to earn the Chairboys a point, and allow United to move three points of the Swans.
The gap between United and fourth spot is extended to seven points, with Southend playing out a goalless draw with Notts County at Roots Hall.
Most play-off challengers failed to win, allowing Macclesfield to take over in seventh place after beating relegation-threatened Kidderminster.
The Cods picked up a surprise 2-1 win over Leyton Orient at Brisbane Road.
Bristol Rovers striker Junior Agogo turned from hero to villain within seconds
against Lincoln, he hit an equalising goal after 67 minutes - but was promptly shown a red card after swearing at his own bench.