Has any city won all 4 major sports championships within a 10 year span?

Yes a team has for example,

The Colorado Rockies did not win the World Series but in 2005 they had the worst record in MLB. 2 years later they won there first pennant and made there second playoff appearance. The lost to Boston all four games and this season (2008) are so far 12-20 on the day of May 6, 2008. So your question is answerd here are some related Q and A

Who are the teams who won the most championships in NHL,NFL,NBA,MLB,

In NBA the Boston Celtics have 15 chapionship wins

In the NHL the Montreal Canadians have 24 Stanley Cup wins

In the NFL was unknown because Lots of tiesA team is a team and will be a team for ever unless they chose not to be a team Clint Hurdle

Colorado Rockies MLB Manager (2002 present