[4] Karo United was declared on 28 July 2019 in Medan City by a board led by the initiator and the club president Arya Mahendra Sinulingga.

[5] In their debut season in the Indonesian football league, Karo United managed to win the 2019 Liga 3 North Sumatra zone after defeating PS Bhinneka with a score of 5–2 and advancing to the Regional Round.

[10] And in the final match, they managed to become champions in Liga 3 this season after beat Putra Delta Sidoarjo on penalties which ended with a score of 4–2.

[12] On 23 February 2025, Sumut United were secure promotion to Liga 2 from next season after defeat NZR Sumbersari 1-5 in last matchweek Championship round Group Y and return to second tier after one year absence for the second time.

Four days later at same month and year, Sumut United secure champions of Liga Nusantara after defeat Tornado FC 4-1 in Champhionship final at Indomilk Arena with goal brace Jalesh Gagarin, Wiraja Aulia and Rico Sitepu and second title in third tier.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.