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Found it again, was wikipedia:

The state in which Fairview resides is ambiguous. License plates on local automobiles and driving licenses refer to "Eagle State". A letter written by Susan Mayer was addressed to Edie Britt in "Fairview, USA". The zip code for Wisteria Lane in Fairview, ES is 00057 (season five). The zip for the police department is 29102 and its area code is 456 (season one). The area code 456 is meant for International Inbound Calls.

Fairview is possibly southern, as the weather is generally warm, and "it doesn't rain very often, but when it does, it pours". No cold or snowy weather has been seen. However, Fairview and the vicinity has experienced violent tornadoes. Fairview is also situated on an ocean coastline and has a marina. The surrounding area seems to be hills, woodland, ponds, nearby lakes (Rockwater Lake and Torch Lake) and within a day's driving distance of rugged, mountainous desert terrain.

In season two, Lonny Moon tells Susan Mayer that his wife and kids are "up in Minnesota," implying Fairview and Eagle State are south of Minnesota. At the end of season one in the flashback that reveals Mary Alice Young's secret, Felicia Tilman, while in Salt Lake City, Utah, says that she has family "way out in Fairview," implying that Fairview is a major town some distance away from Utah.

On second season's episode "Remember" Susan gives Mike a card telling him where they're supposed to be going, and she draws an LA map on it.

In seasons 3 and 4 there was mention of Purdue University and Notre Dame and in season 4 Mike Delfino insists his future son will be a fan of the Indianapolis Colts and Tom Scavo makes a reference to Peyton Manning, suggesting Fairview is located in Indiana, close to Chicago. There is also much mention of people flying in from O'Hare airport in Chicago. These points, including the tornado suggests that Fairview is somewhere in the midwest.

Several times, throughout seasons four and five, various characters mention states "back east", suggesting Fairview is located on, or close to, the west coast of the USA.

New neighbors in the show such as Katherine Mayfair and Betty Applewhite have moved to Wisteria Lane from Chicago. As well as this, Bob and Lee came from New York looking to live a suburban life. It is unlikely they'd move far from the state of New York which is on the east coast of the USA. Furthermore, Bob and Lee have friends from Chicago who informed them of Katherine Mayfair's reasons for leaving Chicago.

Also, local news stations have reported news from Chicago, implying that Fairview is not very far from Illinois.

A local television station bears call letters KQRY, implying that Fairview is west of the Mississippi River.

It is most likely in Indiana, since it seems the most logically and geographically correct given the clues above, and because a few of the cities mentioned in the below section are named after cities in Wisconsin and Michigan, neighboring Indiana, and it's close to Chicago, where characters such as Katherine and Betty come from.