Isthmian League Premier Division er toppdivisjonen i Isthmian League. Det er det sjuende leddet i den engelske fotballserien. Den blir, av sponsorgrunner, ofte referert til som Ryman League Premier Division.
Vinneren av divisjonen rykker opp til Conference South. Klubbene fra nr. 2 til nr. 5 spiller play-off. Vinneren av denne rykker også opp. Klubber som rykker ned havner enten i Isthmian League First Division eller Southern League Division One East, avhenging av hvor de er fra.
Klubber 2009/10 KlubbPosisjon forrige sesongAFC Hornchurch 6 Ashford Town 10Aveley 1, Ishtmian League Division One NorthBillericay Town 11Bognor Regis Town 21, Conference SouthBoreham Wood 18Canvey Island 12Carshalton Athletic 4Cray Wanderers 2, Ishtmian League Division One SouthDartford 8Harrow Borough 14Hastings United 17Hendon 16Horsham 13Kingstonian 1, Ishtmian League Division One SouthMaidstone United 15Margate 19Sutton United 5Tonbridge Angels 3Tooting and Mitcham United 9Waltham Abbey 4, Ishtmian League Division One NorthWealdstone 7
Mestere SesongMestere1905–06 London Caledonians1906–07 Ilford1907–08 London Caledonians1908–09 Bromley1909–10 Bromley1910–11 Clapton1911–12 London Caledonians1912–13 London Caledonians1913–14 London Caledonians1914–19 Utsatt på grunn av 1. verdenskrig1919 Leytonstone1919–20 Dulwich Hamlet1920–21 Ilford1921–22 Ilford1922–23 Clapton1923–24 St Albans City1924–25 London Caledonians1925–26 Dulwich Hamlet1926–27 St Albans City1927–28 St Albans City1928–29 Nunhead1929–30 Nunhead1930–31 Wimbledon1931–32 Wimbledon1932–33 Dulwich Hamlet1933–34 Kingstonian1934–35 Wimbledon1935–36 Wimbledon1936–37 Kingstonian1937–38 Leytonstone1938–39 Leytonstone1939–45 Utsatt på grunn av 2. verdenskrig1945–46 Walthamstow Avenue1946–47 Leytonstone1947–48 Leytonstone1948–49 Dulwich Hamlet1949–50 Leytonstone1950–51 Leytonstone1951–52 Leytonstone1952–53 Walthamstow Avenue1953–54 Bromley1954–55 Walthamstow Avenue1955–56 Wycombe Wanderers1956–57 Wycombe Wanderers1957–58 Tooting & Mitcham United1958–59 Wimbledon1959–60 Tooting & Mitcham United1960–61 Bromley1961–62 Wimbledon1962–63 Wimbledon1963–64 Wimbledon1964–65 Hendon1965–66 Leytonstone1966–67 Sutton United1967–68 Enfield1968–69 Enfield1969–70 Enfield1970–71 Wycombe Wanderers1971–72 Wycombe Wanderers1972–73 Hendon1973–74Wycombe Wanderers1974–75Wycombe Wanderers1975–76Enfield1976–77Enfield1977–78 Enfield1978–79Barking1979–80Enfield1980–81Slough Town1981–82Leytonstone & Ilford1982–83Wycombe Wanderers1983–84Harrow Borough1984–85Sutton United1985–86Sutton United1986–87Wycombe Wanderers1987–88Yeovil Town1988–89Leytonstone/Ilford1989–90Sutton United1990–91Redbridge Forest1991–92Woking1992–93Chesham United1993–94Stevenage Borough1994–95Enfield1995–96Hayes1996–97Yeovil Town1997–98Kingstonian1998–99Sutton United1999–00Dagenham & Redbridge2000–01Farnborough Town2001–02Gravesend & Northfleet2002–03Aldershot Town2003–04Canvey Island2004–05Yeading2005–06Braintree Town2006–07Hampton & Richmond Borough2007–08Chelmsford City2008–09Dover Athletic
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