Homes are more affordable to more families, according to the latest index for the first quarter of 2011 that shows affordability reaching its highest level in more than 20 years.

Nearly 75 percent of all new and existing homes sold in the first quarter of 2011 were affordable to families earning the national median income of $64,400, according to the National Association of Home Builders/Wells Fargo Housing Opportunity Index. The previous high was set in the fourth quarter of 2010 with 73.9 percent.

“With interest rates remaining at historically low levels, today’s report indicates that home ownership is within reach of more households than it has been for more than two decades,” says Bob Nielsen, chairman of the National Association of Home Builders.

The most affordable metro housing market in the nation? Syracuse, N.Y., in which 94.5 percent of all homes sold were affordable to households earning the area’s median family income of $64,300.

Other metro cities ranking high on the affordability index were Youngstown-Warren-Boardman, Ohio-Pa.; Indianapolis-Carmel, Ind.; Warren-Troy-Farmington Hills, Mich.; and Toledo, Ohio.

Meanwhile, the least affordable major housing market for the first quarter of 2011 was New York-White Plains-Wayne, N.Y.-N.J.

Source: “Housing Affordability Rises to Record Level, Tight Financing Continues to Constrain Sales,” National Association of Home Builders (May 25, 2011)