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Only a few homeowners can afford the best. Here are the ZIP codes with the most expensive houses in a sampling of states, based on the highest median prices of housing sold in July, 1988, in more than 500 counties for which data was collected.

Median ZIP Purchase National State City Code Price Rank California San Francisco 94108 $659,000 1 Connecticut New Canaan 06840 372,000 32 Georgia Dunwoody 30350 322,000 70 Illinois Winnetka 60093 381,000 27 Indiana Granger 46530 108,000 1988 Iowa Davenport 52807 114,000 1869 Maryland Potomac 20854 406,000 20 Massachusetts Weston 02193 450,000 13 Minnesota Eden Prairie 55344 120,000 1721 New Jersey Saddle River 07458 500,000 8 New York Scarsdale 10583 495,000 9 North Dakota Fargo 58103 80,000 3034 Oklahoma Tulsa 74137 122,000 1654 Texas Dallas 75225 342,000 52 Virginia Great Falls 22066 567,000 6 West Virginia Charleston 25314 84,000 2862 Wisconsin Shorewood 53211 108,000 1992

Note: The median price and national rank are based on 10 or more housing sales in that ZIP code.

SOURCE: Dataman Information Services Inc., Atlanta, Ga.