1999–2000 United Counties League

The 1999–2000 United Counties League season was the 93rd in the history of the United Counties League, a football competition in England.

Premier Division
The Premier Division featured 19 clubs which competed in the division last season, along with one new club, promoted from Division One:
 * Bugbrooke St Michaels

Division One
Division One featured 17 clubs which competed in the division last season, along with one new club:
 * Deeping Rangers, joined from the Peterborough and District League