4 cities and 23 states have a 3' Law or a Safe Passing Law or Ordinance. Ironically 2 of the cities, Austin and San Antonio, Texas have a 3' Ordinace in a state that vetoed the bill at the state level. Boise, Idaho and Tupelo, Mississippi have the ordinance as well with no legislation at the state level.
11 States have current bills before their respective state legislatures. In 1 state, Iowa, it is a 5' Passing Law, not 3'. In South Dakota the issue is tabled as of 02/11/2010.
16 states have no legislation.
Wisconsin was the first state to pass legislation in 1973. It took another 27 years to happen again in Arizona in 2000. The next was Minnesota in 2004. Since then the trend has been differant states every year to the present. Hopefuly 2010 is the year Iowa finally passes the bil into law.
Link to chart:
3 Feet Please, State by State