Counties going from Red to Blue

[RBH]

Basically this could be a short list of major places where the voting trends have went from heavily Republican to being split, or from being Republican to heavily Democratic, in the last 20 or 30 years.

A few of these places that I can think of..

Johnson County, Kansas (well, almost)
St. Louis County, Missouri

Henrico County, Virginia (Over 60% for the Republicans every time from 1952 to 1988, went 54/46 for Bush in 2004)

Almost every county in the San Francisco Bay area other than Alameda and San Francisco.

Probably a lot of other examples of places where Suburban Sprawl has led to a change in voting habits.

[Kevin]

My old county of Fairfax has become blue big time mainly due to an influx of immgrants. Also my new county of Loudoun is is floating blue due to many of the people around here not being from VA. 

[Padfoot]

Franklin County, Ohio has been moving slowly left for a while now as the city of Columbus has grown.  From 1968-1992 it voted GOP and it just started voting Democrat in 1996.  From 1992-2000 neither candidate broke 50%.  Kerry was the first Democrat to win a majority in the county since LBJ in 1964.  Kerry even managed to do six points better than Gore, although half of that can be attributed to Nader.  Without Nader, Gore likely would have taken a 51% majority in the county compared to Kerry's 54% in 2004.

[Tender Branson]

Oakland County in Michigan. JFK didn´t win it, Johnson did in 1964, stayed Republican until 1996. 2000 and 2004 slightly won by Gore and Kerry.

[Tender Branson]

Marion County (Indianapolis) is trending Democratic. Last time won by a Democrat in 1964 and 2004 by Kerry.

[Tender Branson]

Also, Travis County is a good example and Dallas County might be "blue" next year.

[ag]

Nassau and Suffolk counties, NY. Nuff said.

[Filuwaúrdjan]

Oakland County in Michigan. JFK didn´t win it, Johnson did in 1964, stayed Republican until 1996. 2000 and 2004 slightly won by Gore and Kerry.

Oakland county is hideously polarised:

[Verily]

My home county of Bergen, New Jersey. Before  1996, it hadn't gone Democrat since 1964, and probably didn't go Democrat before that pretty much ever. This is actually because Bergen used to be wealthy suburbs but has been slowly absorbed into the "peripheral city" that surrounds New York City. Northern Bergen County retains its strong economic rightism and still votes Republican, but Bergen's status as a swing county is probably coming to a close, given that it was one of the counties affected by the 9/11 effect in 2004 and still voted Democrat.

(9/11-effect counties are the boroughs of New York; Bergen, Essex and Union, New Jersey; Westchester, Rockland and Nassau, New York; and Fairfield, Connecticut.)

[Alcon]

In Washington, San Juan County has gone from being the most Republican county in the state to the most Democratic over the past 30 years or so.

[Smash255]

Though some of these saw a swing back in the GOP direction in 04 due to Bush's 9/11 Bump many suburban NYC counties have gone from GOP to Dem

Nassau (my county)
Suffolk
Westchester
Rockland

as well as a bunch of others

[they don't love you like i love you]

Olmsted, Minnesota. Home of Rochester.

It voted over 60% for Ford and voted for Dole by 3 votes. Bush only won it by 5 points, he only won Rochester proper by 2 points, and Democrats now control 3/4 of Rochester's State House seats.

[memphis]

Shelby TN has gone from Dixiecrat to slight Republican to slight Dem to heavy Dem. Most dramatic are suburban areas (SE Memphis especially) that have gone all Republican whites to all Democratic blacks.

[RBH]

Clayton County, Georgia: 73/27 for Reagan in 84, 70/29 for Kerry