finished bottom of the league in 1970–71, the last season before it merged with the Greater London League to form the Metropolitan–London League. Despite their lowly finish the previous season, Hatfield were placed in Division One, where they remained until the league merged with the Spartan League to form the London Spartan League in 1975, with Hatfield placed in Division One. Hatfield finished second-from-bottom of Division One in 1976–77 and were relegated to the Senior Division. However, league restructuring saw them placed in the Premier Division for the 1978–79 season as the league was reduced to a single division. In 1979 the club joined Division One of the South Midlands League. They were Division One champions their first season, earning promotion to the Premier Division. However, after finishing fifth in 1983–84, the club folded due to financial difficulties. The club was reformed in 1989 as Hatfield Town Athletic, joining Division Two of the Hertfordshire Senior County League. They were Division Two champions in 1989–90, Division One champions in 1990–91 and Premier Division champions in 1991–92, after which they rejoined the South Midlands League Premier Division as Hatfield Town. Despite being Premier Division runners-up in 1995–96, they folded again at the end of the season. After being reformed in 1997, the club joined Division One of the Hertfordshire Senior County League, finishing as runners-up in their first season and earning promotion to the Premier Division. The next few seasons saw Hatfield become a yo-yo club as they were relegated to Division One at the end of the 1999–2000 season and then promoted the following season as Division One champions. Relegated again in 2001–02 after finishing bottom of the Premier Division, they were Division One champions the following season, earning an immediate return to the Premier Division. In 2007–08 the club were Premier Division champions, resulting in promotion to Division One of the Spartan South Midlands League. A third-place finish in Division One in 2008–09 saw the club earn promotion to the Premier Division at the first attempt. After two seasons in mid-table, the club finished bottom of the Premier Division in 2011–12, but were reprieved from relegation. Although they were reprieved again the following season, a third successive bottom two finish in 2013–14 saw the club relegated to Division One. In 2018–19 Hatfield finished bottom of Division One and were relegated to the Premier Division of the Hertfordshire Senior County League.