Bill Ritter, Roy Romer and Richard Lamm are three of Colorado's 36 former governors, as of January 2016. Stephen McNichols was the first governor to serve a four-year term in office. John Routt was the first governor of Colorado.
Routt became Colorado's territorial governor in 1875 and was elected as the first state governor in 1876 after Colorado became America's 38th state. Route served until 1879 and returned for one term from 1891 to 1893.
McNichols served as Colorado's governor from 1957 to 1963. He served a two-year term before he was elected to the first four-year term after the state constitution was amended in 1957, a change that officially took effect in 1959. He previously served in the state Senate and as lieutenant governor.
Lamm was the first Colorado governor to serve three four-year terms from 1985 to 1997. He also served with the Colorado Antidiscrimination Commission and the Colorado House of Representatives.
Romer also served three terms from 1997 to 2009. He was the last governor to serve three terms after the state constitution was amended in 1990 to limit a governor from serving more than two consecutive terms. Romer previously served in the state House and Senate and as agriculture commissioner and state treasurer.
Ritter was the first Colorado-born governor in four decades when he was elected in 2006. He served one term from 2007 to 2011. Ritter served as Denver's district attorney for 12 years before he ran for governor.